st.c

   1 /* See LICENSE for license details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <X11/XKBlib.h>
  31 #include <fontconfig/fontconfig.h>
  32 #include <wchar.h>
  33
  34 #include "arg.h"
  35
  36 char *argv0;
  37
  38 #define Glyph Glyph_
  39 #define Font Font_
  40
  41 #if   defined(__linux)
  42  #include <pty.h>
  43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  44  #include <util.h>
  45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  46  #include <libutil.h>
  47 #endif
  48
  49
  50 /* XEMBED messages */
  51 #define XEMBED_FOCUS_IN  4
  52 #define XEMBED_FOCUS_OUT 5
  53
  54 /* Arbitrary sizes */
  55 #define UTF_INVALID   0xFFFD
  56 #define UTF_SIZ       4
  57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  58 #define ESC_ARG_SIZ   16
  59 #define STR_BUF_SIZ   ESC_BUF_SIZ
  60 #define STR_ARG_SIZ   ESC_ARG_SIZ
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 /* macros */
  66 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  67 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  68 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  69 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  70 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  71 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  72 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  73 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  74 #define ISDELIM(u) (BETWEEN(u, 0, 127) && strchr(worddelimiters, u) != NULL)
  75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  80
  81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  82 #define IS_TRUECOL(x)    (1 << 24 & (x))
  83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  84 #define TRUEGREEN(x)     (((x) & 0xff00))
  85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  86
  87
  88 enum glyph_attribute {
  89         ATTR_NULL       = 0,
  90         ATTR_BOLD       = 1 << 0,
  91         ATTR_FAINT      = 1 << 1,
  92         ATTR_ITALIC     = 1 << 2,
  93         ATTR_UNDERLINE  = 1 << 3,
  94         ATTR_BLINK      = 1 << 4,
  95         ATTR_REVERSE    = 1 << 5,
  96         ATTR_INVISIBLE  = 1 << 6,
  97         ATTR_STRUCK     = 1 << 7,
  98         ATTR_WRAP       = 1 << 8,
  99         ATTR_WIDE       = 1 << 9,
 100         ATTR_WDUMMY     = 1 << 10,
 101         ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1 << 0,
 117         MODE_INSERT      = 1 << 1,
 118         MODE_APPKEYPAD   = 1 << 2,
 119         MODE_ALTSCREEN   = 1 << 3,
 120         MODE_CRLF        = 1 << 4,
 121         MODE_MOUSEBTN    = 1 << 5,
 122         MODE_MOUSEMOTION = 1 << 6,
 123         MODE_REVERSE     = 1 << 7,
 124         MODE_KBDLOCK     = 1 << 8,
 125         MODE_HIDE        = 1 << 9,
 126         MODE_ECHO        = 1 << 10,
 127         MODE_APPCURSOR   = 1 << 11,
 128         MODE_MOUSESGR    = 1 << 12,
 129         MODE_8BIT        = 1 << 13,
 130         MODE_BLINK       = 1 << 14,
 131         MODE_FBLINK      = 1 << 15,
 132         MODE_FOCUS       = 1 << 16,
 133         MODE_MOUSEX10    = 1 << 17,
 134         MODE_MOUSEMANY   = 1 << 18,
 135         MODE_BRCKTPASTE  = 1 << 19,
 136         MODE_PRINT       = 1 << 20,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_FOCUSED = 2
 163 };
 164
 165 enum selection_mode {
 166         SEL_IDLE = 0,
 167         SEL_EMPTY = 1,
 168         SEL_READY = 2
 169 };
 170
 171 enum selection_type {
 172         SEL_REGULAR = 1,
 173         SEL_RECTANGULAR = 2
 174 };
 175
 176 enum selection_snap {
 177         SNAP_WORD = 1,
 178         SNAP_LINE = 2
 179 };
 180
 181 typedef unsigned char uchar;
 182 typedef unsigned int uint;
 183 typedef unsigned long ulong;
 184 typedef unsigned short ushort;
 185
 186 typedef uint_least32_t Rune;
 187
 188 typedef XftDraw *Draw;
 189 typedef XftColor Color;
 190
 191 typedef struct {
 192         Rune u;           /* character code */
 193         ushort mode;      /* attribute flags */
 194         ushort fg;        /* foreground  */
 195         ushort bg;        /* background  */
 196 } Glyph;
 197
 198 typedef Glyph *Line;
 199
 200 typedef struct {
 201         Glyph attr; /* current char attributes */
 202         int x;
 203         int y;
 204         char state;
 205 } TCursor;
 206
 207 /* CSI Escape sequence structs */
 208 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
 209 typedef struct {
 210         char buf[ESC_BUF_SIZ]; /* raw string */
 211         int len;               /* raw string length */
 212         char priv;
 213         int arg[ESC_ARG_SIZ];
 214         int narg;              /* nb of args */
 215         char mode[2];
 216 } CSIEscape;
 217
 218 /* STR Escape sequence structs */
 219 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 220 typedef struct {
 221         char type;             /* ESC type ... */
 222         char buf[STR_BUF_SIZ]; /* raw string */
 223         int len;               /* raw string length */
 224         char *args[STR_ARG_SIZ];
 225         int narg;              /* nb of args */
 226 } STREscape;
 227
 228 /* Internal representation of the screen */
 229 typedef struct {
 230         int row;      /* nb row */
 231         int col;      /* nb col */
 232         Line *line;   /* screen */
 233         Line *alt;    /* alternate screen */
 234         bool *dirty;  /* dirtyness of lines */
 235         XftGlyphFontSpec *specbuf; /* font spec buffer used for rendering */
 236         TCursor c;    /* cursor */
 237         int top;      /* top    scroll limit */
 238         int bot;      /* bottom scroll limit */
 239         int mode;     /* terminal mode flags */
 240         int esc;      /* escape state flags */
 241         char trantbl[4]; /* charset table translation */
 242         int charset;  /* current charset */
 243         int icharset; /* selected charset for sequence */
 244         bool numlock; /* lock numbers in keyboard */
 245         bool *tabs;
 246 } Term;
 247
 248 /* Purely graphic info */
 249 typedef struct {
 250         Display *dpy;
 251         Colormap cmap;
 252         Window win;
 253         Drawable buf;
 254         Atom xembed, wmdeletewin, netwmname, netwmpid;
 255         XIM xim;
 256         XIC xic;
 257         Draw draw;
 258         Visual *vis;
 259         XSetWindowAttributes attrs;
 260         int scr;
 261         bool isfixed; /* is fixed geometry? */
 262         int l, t; /* left and top offset */
 263         int gm; /* geometry mask */
 264         int tw, th; /* tty width and height */
 265         int w, h; /* window width and height */
 266         int ch; /* char height */
 267         int cw; /* char width  */
 268         char state; /* focus, redraw, visible */
 269         int cursor; /* cursor style */
 270 } XWindow;
 271
 272 typedef struct {
 273         uint b;
 274         uint mask;
 275         char *s;
 276 } Mousekey;
 277
 278 typedef struct {
 279         KeySym k;
 280         uint mask;
 281         char *s;
 282         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 283         signed char appkey;    /* application keypad */
 284         signed char appcursor; /* application cursor */
 285         signed char crlf;      /* crlf mode          */
 286 } Key;
 287
 288 typedef struct {
 289         int mode;
 290         int type;
 291         int snap;
 292         /*
 293          * Selection variables:
 294          * nb – normalized coordinates of the beginning of the selection
 295          * ne – normalized coordinates of the end of the selection
 296          * ob – original coordinates of the beginning of the selection
 297          * oe – original coordinates of the end of the selection
 298          */
 299         struct {
 300                 int x, y;
 301         } nb, ne, ob, oe;
 302
 303         char *primary, *clipboard;
 304         Atom xtarget;
 305         bool alt;
 306         struct timespec tclick1;
 307         struct timespec tclick2;
 308 } Selection;
 309
 310 typedef union {
 311         int i;
 312         uint ui;
 313         float f;
 314         const void *v;
 315 } Arg;
 316
 317 typedef struct {
 318         uint mod;
 319         KeySym keysym;
 320         void (*func)(const Arg *);
 321         const Arg arg;
 322 } Shortcut;
 323
 324 /* function definitions used in config.h */
 325 static void clipcopy(const Arg *);
 326 static void clippaste(const Arg *);
 327 static void numlock(const Arg *);
 328 static void selpaste(const Arg *);
 329 static void xzoom(const Arg *);
 330 static void xzoomabs(const Arg *);
 331 static void xzoomreset(const Arg *);
 332 static void printsel(const Arg *);
 333 static void printscreen(const Arg *) ;
 334 static void toggleprinter(const Arg *);
 335
 336 /* Config.h for applying patches and the configuration. */
 337 #include "config.h"
 338
 339 /* Font structure */
 340 typedef struct {
 341         int height;
 342         int width;
 343         int ascent;
 344         int descent;
 345         short lbearing;
 346         short rbearing;
 347         XftFont *match;
 348         FcFontSet *set;
 349         FcPattern *pattern;
 350 } Font;
 351
 352 /* Drawing Context */
 353 typedef struct {
 354         Color col[MAX(LEN(colorname), 256)];
 355         Font font, bfont, ifont, ibfont;
 356         GC gc;
 357 } DC;
 358
 359 static void die(const char *, ...);
 360 static void draw(void);
 361 static void redraw(void);
 362 static void drawregion(int, int, int, int);
 363 static void execsh(void);
 364 static void stty(void);
 365 static void sigchld(int);
 366 static void run(void);
 367
 368 static void csidump(void);
 369 static void csihandle(void);
 370 static void csiparse(void);
 371 static void csireset(void);
 372 static int eschandle(uchar);
 373 static void strdump(void);
 374 static void strhandle(void);
 375 static void strparse(void);
 376 static void strreset(void);
 377
 378 static int tattrset(int);
 379 static void tprinter(char *, size_t);
 380 static void tdumpsel(void);
 381 static void tdumpline(int);
 382 static void tdump(void);
 383 static void tclearregion(int, int, int, int);
 384 static void tcursor(int);
 385 static void tdeletechar(int);
 386 static void tdeleteline(int);
 387 static void tinsertblank(int);
 388 static void tinsertblankline(int);
 389 static int tlinelen(int);
 390 static void tmoveto(int, int);
 391 static void tmoveato(int, int);
 392 static void tnew(int, int);
 393 static void tnewline(int);
 394 static void tputtab(int);
 395 static void tputc(Rune);
 396 static void treset(void);
 397 static void tresize(int, int);
 398 static void tscrollup(int, int);
 399 static void tscrolldown(int, int);
 400 static void tsetattr(int *, int);
 401 static void tsetchar(Rune, Glyph *, int, int);
 402 static void tsetscroll(int, int);
 403 static void tswapscreen(void);
 404 static void tsetdirt(int, int);
 405 static void tsetdirtattr(int);
 406 static void tsetmode(bool, bool, int *, int);
 407 static void tfulldirt(void);
 408 static void techo(Rune);
 409 static void tcontrolcode(uchar );
 410 static void tdectest(char );
 411 static int32_t tdefcolor(int *, int *, int);
 412 static void tdeftran(char);
 413 static inline bool match(uint, uint);
 414 static void ttynew(void);
 415 static void ttyread(void);
 416 static void ttyresize(void);
 417 static void ttysend(char *, size_t);
 418 static void ttywrite(const char *, size_t);
 419 static void tstrsequence(uchar);
 420
 421 static inline ushort sixd_to_16bit(int);
 422 static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
 423 static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
 424 static void xdrawglyph(Glyph, int, int);
 425 static void xhints(void);
 426 static void xclear(int, int, int, int);
 427 static void xdrawcursor(void);
 428 static void xinit(void);
 429 static void xloadcols(void);
 430 static int xsetcolorname(int, const char *);
 431 static int xgeommasktogravity(int);
 432 static int xloadfont(Font *, FcPattern *);
 433 static void xloadfonts(char *, double);
 434 static void xsettitle(char *);
 435 static void xresettitle(void);
 436 static void xsetpointermotion(int);
 437 static void xseturgency(int);
 438 static void xsetsel(char *, Time);
 439 static void xtermclear(int, int, int, int);
 440 static void xunloadfont(Font *);
 441 static void xunloadfonts(void);
 442 static void xresize(int, int);
 443
 444 static void expose(XEvent *);
 445 static void visibility(XEvent *);
 446 static void unmap(XEvent *);
 447 static char *kmap(KeySym, uint);
 448 static void kpress(XEvent *);
 449 static void cmessage(XEvent *);
 450 static void cresize(int, int);
 451 static void resize(XEvent *);
 452 static void focus(XEvent *);
 453 static void brelease(XEvent *);
 454 static void bpress(XEvent *);
 455 static void bmotion(XEvent *);
 456 static void selnotify(XEvent *);
 457 static void selclear(XEvent *);
 458 static void selrequest(XEvent *);
 459
 460 static void selinit(void);
 461 static void selnormalize(void);
 462 static inline bool selected(int, int);
 463 static char *getsel(void);
 464 static void selcopy(Time);
 465 static void selscroll(int, int);
 466 static void selsnap(int *, int *, int);
 467 static int x2col(int);
 468 static int y2row(int);
 469 static void getbuttoninfo(XEvent *);
 470 static void mousereport(XEvent *);
 471
 472 static size_t utf8decode(char *, Rune *, size_t);
 473 static Rune utf8decodebyte(char, size_t *);
 474 static size_t utf8encode(Rune, char *);
 475 static char utf8encodebyte(Rune, size_t);
 476 static size_t utf8validate(Rune *, size_t);
 477
 478 static ssize_t xwrite(int, const char *, size_t);
 479 static void *xmalloc(size_t);
 480 static void *xrealloc(void *, size_t);
 481 static char *xstrdup(char *);
 482
 483 static void usage(void);
 484
 485 static void (*handler[LASTEvent])(XEvent *) = {
 486         [KeyPress] = kpress,
 487         [ClientMessage] = cmessage,
 488         [ConfigureNotify] = resize,
 489         [VisibilityNotify] = visibility,
 490         [UnmapNotify] = unmap,
 491         [Expose] = expose,
 492         [FocusIn] = focus,
 493         [FocusOut] = focus,
 494         [MotionNotify] = bmotion,
 495         [ButtonPress] = bpress,
 496         [ButtonRelease] = brelease,
 497 /*
 498  * Uncomment if you want the selection to disappear when you select something
 499  * different in another window.
 500  */
 501 /*      [SelectionClear] = selclear, */
 502         [SelectionNotify] = selnotify,
 503         [SelectionRequest] = selrequest,
 504 };
 505
 506 /* Globals */
 507 static DC dc;
 508 static XWindow xw;
 509 static Term term;
 510 static CSIEscape csiescseq;
 511 static STREscape strescseq;
 512 static int cmdfd;
 513 static pid_t pid;
 514 static Selection sel;
 515 static int iofd = STDOUT_FILENO;
 516 static char **opt_cmd = NULL;
 517 static char *opt_io = NULL;
 518 static char *opt_title = NULL;
 519 static char *opt_embed = NULL;
 520 static char *opt_class = NULL;
 521 static char *opt_font = NULL;
 522 static char *opt_line = NULL;
 523 static int oldbutton = 3; /* button event on startup: 3 = release */
 524
 525 static char *usedfont = NULL;
 526 static double usedfontsize = 0;
 527 static double defaultfontsize = 0;
 528
 529 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 530 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 531 static Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 532 static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 533
 534 /* Font Ring Cache */
 535 enum {
 536         FRC_NORMAL,
 537         FRC_ITALIC,
 538         FRC_BOLD,
 539         FRC_ITALICBOLD
 540 };
 541
 542 typedef struct {
 543         XftFont *font;
 544         int flags;
 545         Rune unicodep;
 546 } Fontcache;
 547
 548 /* Fontcache is an array now. A new font will be appended to the array. */
 549 static Fontcache frc[16];
 550 static int frclen = 0;
 551
 552 ssize_t
 553 xwrite(int fd, const char *s, size_t len) {
 554         size_t aux = len;
 555
 556         while(len > 0) {
 557                 ssize_t r = write(fd, s, len);
 558                 if(r < 0)
 559                         return r;
 560                 len -= r;
 561                 s += r;
 562         }
 563         return aux;
 564 }
 565
 566 void *
 567 xmalloc(size_t len) {
 568         void *p = malloc(len);
 569
 570         if(!p)
 571                 die("Out of memory\n");
 572
 573         return p;
 574 }
 575
 576 void *
 577 xrealloc(void *p, size_t len) {
 578         if((p = realloc(p, len)) == NULL)
 579                 die("Out of memory\n");
 580
 581         return p;
 582 }
 583
 584 char *
 585 xstrdup(char *s) {
 586         if((s = strdup(s)) == NULL)
 587                 die("Out of memory\n");
 588
 589         return s;
 590 }
 591
 592 size_t
 593 utf8decode(char *c, Rune *u, size_t clen) {
 594         size_t i, j, len, type;
 595         Rune udecoded;
 596
 597         *u = UTF_INVALID;
 598         if(!clen)
 599                 return 0;
 600         udecoded = utf8decodebyte(c[0], &len);
 601         if(!BETWEEN(len, 1, UTF_SIZ))
 602                 return 1;
 603         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 604                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 605                 if(type != 0)
 606                         return j;
 607         }
 608         if(j < len)
 609                 return 0;
 610         *u = udecoded;
 611         utf8validate(u, len);
 612         return len;
 613 }
 614
 615 Rune
 616 utf8decodebyte(char c, size_t *i) {
 617         for(*i = 0; *i < LEN(utfmask); ++(*i))
 618                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 619                         return (uchar)c & ~utfmask[*i];
 620         return 0;
 621 }
 622
 623 size_t
 624 utf8encode(Rune u, char *c) {
 625         size_t len, i;
 626
 627         len = utf8validate(&u, 0);
 628         if(len > UTF_SIZ)
 629                 return 0;
 630         for(i = len - 1; i != 0; --i) {
 631                 c[i] = utf8encodebyte(u, 0);
 632                 u >>= 6;
 633         }
 634         c[0] = utf8encodebyte(u, len);
 635         return len;
 636 }
 637
 638 char
 639 utf8encodebyte(Rune u, size_t i) {
 640         return utfbyte[i] | (u & ~utfmask[i]);
 641 }
 642
 643 size_t
 644 utf8validate(Rune *u, size_t i) {
 645         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 646                 *u = UTF_INVALID;
 647         for(i = 1; *u > utfmax[i]; ++i)
 648                 ;
 649         return i;
 650 }
 651
 652 void
 653 selinit(void) {
 654         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 655         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 656         sel.mode = SEL_IDLE;
 657         sel.ob.x = -1;
 658         sel.primary = NULL;
 659         sel.clipboard = NULL;
 660         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 661         if(sel.xtarget == None)
 662                 sel.xtarget = XA_STRING;
 663 }
 664
 665 int
 666 x2col(int x) {
 667         x -= borderpx;
 668         x /= xw.cw;
 669
 670         return LIMIT(x, 0, term.col-1);
 671 }
 672
 673 int
 674 y2row(int y) {
 675         y -= borderpx;
 676         y /= xw.ch;
 677
 678         return LIMIT(y, 0, term.row-1);
 679 }
 680
 681 int
 682 tlinelen(int y) {
 683         int i = term.col;
 684
 685         if(term.line[y][i - 1].mode & ATTR_WRAP)
 686                 return i;
 687
 688         while(i > 0 && term.line[y][i - 1].u == ' ')
 689                 --i;
 690
 691         return i;
 692 }
 693
 694 void
 695 selnormalize(void) {
 696         int i;
 697
 698         if(sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
 699                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 700                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 701         } else {
 702                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 703                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 704         }
 705         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 706         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 707
 708         selsnap(&sel.nb.x, &sel.nb.y, -1);
 709         selsnap(&sel.ne.x, &sel.ne.y, +1);
 710
 711         /* expand selection over line breaks */
 712         if (sel.type == SEL_RECTANGULAR)
 713                 return;
 714         i = tlinelen(sel.nb.y);
 715         if (i < sel.nb.x)
 716                 sel.nb.x = i;
 717         if (tlinelen(sel.ne.y) <= sel.ne.x)
 718                 sel.ne.x = term.col - 1;
 719 }
 720
 721 bool
 722 selected(int x, int y) {
 723         if(sel.mode == SEL_EMPTY)
 724                 return false;
 725
 726         if(sel.type == SEL_RECTANGULAR)
 727                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 728                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 729
 730         return BETWEEN(y, sel.nb.y, sel.ne.y)
 731             && (y != sel.nb.y || x >= sel.nb.x)
 732             && (y != sel.ne.y || x <= sel.ne.x);
 733 }
 734
 735 void
 736 selsnap(int *x, int *y, int direction) {
 737         int newx, newy, xt, yt;
 738         bool delim, prevdelim;
 739         Glyph *gp, *prevgp;
 740
 741         switch(sel.snap) {
 742         case SNAP_WORD:
 743                 /*
 744                  * Snap around if the word wraps around at the end or
 745                  * beginning of a line.
 746                  */
 747                 prevgp = &term.line[*y][*x];
 748                 prevdelim = ISDELIM(prevgp->u);
 749                 for(;;) {
 750                         newx = *x + direction;
 751                         newy = *y;
 752                         if(!BETWEEN(newx, 0, term.col - 1)) {
 753                                 newy += direction;
 754                                 newx = (newx + term.col) % term.col;
 755                                 if (!BETWEEN(newy, 0, term.row - 1))
 756                                         break;
 757
 758                                 if(direction > 0)
 759                                         yt = *y, xt = *x;
 760                                 else
 761                                         yt = newy, xt = newx;
 762                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 763                                         break;
 764                         }
 765
 766                         if (newx >= tlinelen(newy))
 767                                 break;
 768
 769                         gp = &term.line[newy][newx];
 770                         delim = ISDELIM(gp->u);
 771                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
 772                                         || (delim && gp->u != prevgp->u)))
 773                                 break;
 774
 775                         *x = newx;
 776                         *y = newy;
 777                         prevgp = gp;
 778                         prevdelim = delim;
 779                 }
 780                 break;
 781         case SNAP_LINE:
 782                 /*
 783                  * Snap around if the the previous line or the current one
 784                  * has set ATTR_WRAP at its end. Then the whole next or
 785                  * previous line will be selected.
 786                  */
 787                 *x = (direction < 0) ? 0 : term.col - 1;
 788                 if(direction < 0) {
 789                         for(; *y > 0; *y += direction) {
 790                                 if(!(term.line[*y-1][term.col-1].mode
 791                                                 & ATTR_WRAP)) {
 792                                         break;
 793                                 }
 794                         }
 795                 } else if(direction > 0) {
 796                         for(; *y < term.row-1; *y += direction) {
 797                                 if(!(term.line[*y][term.col-1].mode
 798                                                 & ATTR_WRAP)) {
 799                                         break;
 800                                 }
 801                         }
 802                 }
 803                 break;
 804         }
 805 }
 806
 807 void
 808 getbuttoninfo(XEvent *e) {
 809         int type;
 810         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 811
 812         sel.alt = IS_SET(MODE_ALTSCREEN);
 813
 814         sel.oe.x = x2col(e->xbutton.x);
 815         sel.oe.y = y2row(e->xbutton.y);
 816         selnormalize();
 817
 818         sel.type = SEL_REGULAR;
 819         for(type = 1; type < LEN(selmasks); ++type) {
 820                 if(match(selmasks[type], state)) {
 821                         sel.type = type;
 822                         break;
 823                 }
 824         }
 825 }
 826
 827 void
 828 mousereport(XEvent *e) {
 829         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 830             button = e->xbutton.button, state = e->xbutton.state,
 831             len;
 832         char buf[40];
 833         static int ox, oy;
 834
 835         /* from urxvt */
 836         if(e->xbutton.type == MotionNotify) {
 837                 if(x == ox && y == oy)
 838                         return;
 839                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 840                         return;
 841                 /* MOUSE_MOTION: no reporting if no button is pressed */
 842                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 843                         return;
 844
 845                 button = oldbutton + 32;
 846                 ox = x;
 847                 oy = y;
 848         } else {
 849                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 850                         button = 3;
 851                 } else {
 852                         button -= Button1;
 853                         if(button >= 3)
 854                                 button += 64 - 3;
 855                 }
 856                 if(e->xbutton.type == ButtonPress) {
 857                         oldbutton = button;
 858                         ox = x;
 859                         oy = y;
 860                 } else if(e->xbutton.type == ButtonRelease) {
 861                         oldbutton = 3;
 862                         /* MODE_MOUSEX10: no button release reporting */
 863                         if(IS_SET(MODE_MOUSEX10))
 864                                 return;
 865                         if (button == 64 || button == 65)
 866                                 return;
 867                 }
 868         }
 869
 870         if(!IS_SET(MODE_MOUSEX10)) {
 871                 button += ((state & ShiftMask  ) ? 4  : 0)
 872                         + ((state & Mod4Mask   ) ? 8  : 0)
 873                         + ((state & ControlMask) ? 16 : 0);
 874         }
 875
 876         if(IS_SET(MODE_MOUSESGR)) {
 877                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 878                                 button, x+1, y+1,
 879                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 880         } else if(x < 223 && y < 223) {
 881                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 882                                 32+button, 32+x+1, 32+y+1);
 883         } else {
 884                 return;
 885         }
 886
 887         ttywrite(buf, len);
 888 }
 889
 890 void
 891 bpress(XEvent *e) {
 892         struct timespec now;
 893         Mousekey *mk;
 894
 895         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 896                 mousereport(e);
 897                 return;
 898         }
 899
 900         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 901                 if(e->xbutton.button == mk->b
 902                                 && match(mk->mask, e->xbutton.state)) {
 903                         ttysend(mk->s, strlen(mk->s));
 904                         return;
 905                 }
 906         }
 907
 908         if(e->xbutton.button == Button1) {
 909                 clock_gettime(CLOCK_MONOTONIC, &now);
 910
 911                 /* Clear previous selection, logically and visually. */
 912                 selclear(NULL);
 913                 sel.mode = SEL_EMPTY;
 914                 sel.type = SEL_REGULAR;
 915                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 916                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 917
 918                 /*
 919                  * If the user clicks below predefined timeouts specific
 920                  * snapping behaviour is exposed.
 921                  */
 922                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 923                         sel.snap = SNAP_LINE;
 924                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 925                         sel.snap = SNAP_WORD;
 926                 } else {
 927                         sel.snap = 0;
 928                 }
 929                 selnormalize();
 930
 931                 if(sel.snap != 0)
 932                         sel.mode = SEL_READY;
 933                 tsetdirt(sel.nb.y, sel.ne.y);
 934                 sel.tclick2 = sel.tclick1;
 935                 sel.tclick1 = now;
 936         }
 937 }
 938
 939 char *
 940 getsel(void) {
 941         char *str, *ptr;
 942         int y, bufsize, lastx, linelen;
 943         Glyph *gp, *last;
 944
 945         if(sel.ob.x == -1)
 946                 return NULL;
 947
 948         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 949         ptr = str = xmalloc(bufsize);
 950
 951         /* append every set & selected glyph to the selection */
 952         for(y = sel.nb.y; y <= sel.ne.y; y++) {
 953                 linelen = tlinelen(y);
 954
 955                 if(sel.type == SEL_RECTANGULAR) {
 956                         gp = &term.line[y][sel.nb.x];
 957                         lastx = sel.ne.x;
 958                 } else {
 959                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 960                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 961                 }
 962                 last = &term.line[y][MIN(lastx, linelen-1)];
 963                 while(last >= gp && last->u == ' ')
 964                         --last;
 965
 966                 for( ; gp <= last; ++gp) {
 967                         if(gp->mode & ATTR_WDUMMY)
 968                                 continue;
 969
 970                         ptr += utf8encode(gp->u, ptr);
 971                 }
 972
 973                 /*
 974                  * Copy and pasting of line endings is inconsistent
 975                  * in the inconsistent terminal and GUI world.
 976                  * The best solution seems like to produce '\n' when
 977                  * something is copied from st and convert '\n' to
 978                  * '\r', when something to be pasted is received by
 979                  * st.
 980                  * FIXME: Fix the computer world.
 981                  */
 982                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
 983                         *ptr++ = '\n';
 984         }
 985         *ptr = 0;
 986         return str;
 987 }
 988
 989 void
 990 selcopy(Time t) {
 991         xsetsel(getsel(), t);
 992 }
 993
 994 void
 995 selnotify(XEvent *e) {
 996         ulong nitems, ofs, rem;
 997         int format;
 998         uchar *data, *last, *repl;
 999         Atom type;
1000         XSelectionEvent *xsev;
1001
1002         ofs = 0;
1003         xsev = &e->xselection;
1004         if (xsev->property == None)
1005             return;
1006         do {
1007                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1008                                         BUFSIZ/4, False, AnyPropertyType,
1009                                         &type, &format, &nitems, &rem,
1010                                         &data)) {
1011                         fprintf(stderr, "Clipboard allocation failed\n");
1012                         return;
1013                 }
1014
1015                 /*
1016                  * As seen in getsel:
1017                  * Line endings are inconsistent in the terminal and GUI world
1018                  * copy and pasting. When receiving some selection data,
1019                  * replace all '\n' with '\r'.
1020                  * FIXME: Fix the computer world.
1021                  */
1022                 repl = data;
1023                 last = data + nitems * format / 8;
1024                 while((repl = memchr(repl, '\n', last - repl))) {
1025                         *repl++ = '\r';
1026                 }
1027
1028                 if(IS_SET(MODE_BRCKTPASTE))
1029                         ttywrite("\033[200~", 6);
1030                 ttysend((char *)data, nitems * format / 8);
1031                 if(IS_SET(MODE_BRCKTPASTE))
1032                         ttywrite("\033[201~", 6);
1033                 XFree(data);
1034                 /* number of 32-bit chunks returned */
1035                 ofs += nitems * format / 32;
1036         } while(rem > 0);
1037 }
1038
1039 void
1040 selpaste(const Arg *dummy) {
1041         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1042                         xw.win, CurrentTime);
1043 }
1044
1045 void
1046 clipcopy(const Arg *dummy) {
1047         Atom clipboard;
1048
1049         if(sel.clipboard != NULL)
1050                 free(sel.clipboard);
1051
1052         if(sel.primary != NULL) {
1053                 sel.clipboard = xstrdup(sel.primary);
1054                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1055                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1056         }
1057 }
1058
1059 void
1060 clippaste(const Arg *dummy) {
1061         Atom clipboard;
1062
1063         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1064         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1065                         xw.win, CurrentTime);
1066 }
1067
1068 void
1069 selclear(XEvent *e) {
1070         if(sel.ob.x == -1)
1071                 return;
1072         sel.ob.x = -1;
1073         tsetdirt(sel.nb.y, sel.ne.y);
1074 }
1075
1076 void
1077 selrequest(XEvent *e) {
1078         XSelectionRequestEvent *xsre;
1079         XSelectionEvent xev;
1080         Atom xa_targets, string, clipboard;
1081         char *seltext;
1082
1083         xsre = (XSelectionRequestEvent *) e;
1084         xev.type = SelectionNotify;
1085         xev.requestor = xsre->requestor;
1086         xev.selection = xsre->selection;
1087         xev.target = xsre->target;
1088         xev.time = xsre->time;
1089         if (xsre->property == None)
1090                 xsre->property = xsre->target;
1091
1092         /* reject */
1093         xev.property = None;
1094
1095         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1096         if(xsre->target == xa_targets) {
1097                 /* respond with the supported type */
1098                 string = sel.xtarget;
1099                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1100                                 XA_ATOM, 32, PropModeReplace,
1101                                 (uchar *) &string, 1);
1102                 xev.property = xsre->property;
1103         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1104                 /*
1105                  * xith XA_STRING non ascii characters may be incorrect in the
1106                  * requestor. It is not our problem, use utf8.
1107                  */
1108                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1109                 if(xsre->selection == XA_PRIMARY) {
1110                         seltext = sel.primary;
1111                 } else if(xsre->selection == clipboard) {
1112                         seltext = sel.clipboard;
1113                 } else {
1114                         fprintf(stderr,
1115                                 "Unhandled clipboard selection 0x%lx\n",
1116                                 xsre->selection);
1117                         return;
1118                 }
1119                 if(seltext != NULL) {
1120                         XChangeProperty(xsre->display, xsre->requestor,
1121                                         xsre->property, xsre->target,
1122                                         8, PropModeReplace,
1123                                         (uchar *)seltext, strlen(seltext));
1124                         xev.property = xsre->property;
1125                 }
1126         }
1127
1128         /* all done, send a notification to the listener */
1129         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1130                 fprintf(stderr, "Error sending SelectionNotify event\n");
1131 }
1132
1133 void
1134 xsetsel(char *str, Time t) {
1135         free(sel.primary);
1136         sel.primary = str;
1137
1138         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
1139         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
1140                 selclear(0);
1141 }
1142
1143 void
1144 brelease(XEvent *e) {
1145         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1146                 mousereport(e);
1147                 return;
1148         }
1149
1150         if(e->xbutton.button == Button2) {
1151                 selpaste(NULL);
1152         } else if(e->xbutton.button == Button1) {
1153                 if(sel.mode == SEL_READY) {
1154                         getbuttoninfo(e);
1155                         selcopy(e->xbutton.time);
1156                 } else
1157                         selclear(NULL);
1158                 sel.mode = SEL_IDLE;
1159                 tsetdirt(sel.nb.y, sel.ne.y);
1160         }
1161 }
1162
1163 void
1164 bmotion(XEvent *e) {
1165         int oldey, oldex, oldsby, oldsey;
1166
1167         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1168                 mousereport(e);
1169                 return;
1170         }
1171
1172         if(!sel.mode)
1173                 return;
1174
1175         sel.mode = SEL_READY;
1176         oldey = sel.oe.y;
1177         oldex = sel.oe.x;
1178         oldsby = sel.nb.y;
1179         oldsey = sel.ne.y;
1180         getbuttoninfo(e);
1181
1182         if(oldey != sel.oe.y || oldex != sel.oe.x)
1183                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1184 }
1185
1186 void
1187 die(const char *errstr, ...) {
1188         va_list ap;
1189
1190         va_start(ap, errstr);
1191         vfprintf(stderr, errstr, ap);
1192         va_end(ap);
1193         exit(EXIT_FAILURE);
1194 }
1195
1196 void
1197 execsh(void) {
1198         char **args, *sh, *prog;
1199         const struct passwd *pw;
1200         char buf[sizeof(long) * 8 + 1];
1201
1202         errno = 0;
1203         if((pw = getpwuid(getuid())) == NULL) {
1204                 if(errno)
1205                         die("getpwuid:%s\n", strerror(errno));
1206                 else
1207                         die("who are you?\n");
1208         }
1209
1210         if (!(sh = getenv("SHELL"))) {
1211                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1212         }
1213
1214         if(opt_cmd)
1215                 prog = opt_cmd[0];
1216         else if(utmp)
1217                 prog = utmp;
1218         else
1219                 prog = sh;
1220         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1221
1222         snprintf(buf, sizeof(buf), "%lu", xw.win);
1223
1224         unsetenv("COLUMNS");
1225         unsetenv("LINES");
1226         unsetenv("TERMCAP");
1227         setenv("LOGNAME", pw->pw_name, 1);
1228         setenv("USER", pw->pw_name, 1);
1229         setenv("SHELL", sh, 1);
1230         setenv("HOME", pw->pw_dir, 1);
1231         setenv("TERM", termname, 1);
1232         setenv("WINDOWID", buf, 1);
1233
1234         signal(SIGCHLD, SIG_DFL);
1235         signal(SIGHUP, SIG_DFL);
1236         signal(SIGINT, SIG_DFL);
1237         signal(SIGQUIT, SIG_DFL);
1238         signal(SIGTERM, SIG_DFL);
1239         signal(SIGALRM, SIG_DFL);
1240
1241         execvp(prog, args);
1242         _exit(EXIT_FAILURE);
1243 }
1244
1245 void
1246 sigchld(int a) {
1247         int stat, ret;
1248         pid_t p;
1249
1250         if((p = waitpid(pid, &stat, WNOHANG)) < 0)
1251                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1252
1253         if(pid != p)
1254                 return;
1255
1256         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1257         if (ret != EXIT_SUCCESS)
1258                 die("child finished with error '%d'\n", stat);
1259         exit(EXIT_SUCCESS);
1260 }
1261
1262
1263 void
1264 stty(void)
1265 {
1266         char cmd[_POSIX_ARG_MAX], **p, *q, *s;
1267         size_t n, siz;
1268
1269         if((n = strlen(stty_args)) > sizeof(cmd)-1)
1270                 die("incorrect stty parameters\n");
1271         memcpy(cmd, stty_args, n);
1272         q = cmd + n;
1273         siz = sizeof(cmd) - n;
1274         for(p = opt_cmd; p && (s = *p); ++p) {
1275                 if((n = strlen(s)) > siz-1)
1276                         die("stty parameter length too long\n");
1277                 *q++ = ' ';
1278                 q = memcpy(q, s, n);
1279                 q += n;
1280                 siz-= n + 1;
1281         }
1282         *q = '\0';
1283         if (system(cmd) != 0)
1284             perror("Couldn't call stty");
1285 }
1286
1287 void
1288 ttynew(void) {
1289         int m, s;
1290         struct winsize w = {term.row, term.col, 0, 0};
1291
1292         if(opt_io) {
1293                 term.mode |= MODE_PRINT;
1294                 iofd = (!strcmp(opt_io, "-")) ?
1295                           STDOUT_FILENO :
1296                           open(opt_io, O_WRONLY | O_CREAT, 0666);
1297                 if(iofd < 0) {
1298                         fprintf(stderr, "Error opening %s:%s\n",
1299                                 opt_io, strerror(errno));
1300                 }
1301         }
1302
1303         if (opt_line) {
1304                 if((cmdfd = open(opt_line, O_RDWR)) < 0)
1305                         die("open line failed: %s\n", strerror(errno));
1306                 close(STDIN_FILENO);
1307                 dup(cmdfd);
1308                 stty();
1309                 return;
1310         }
1311
1312         /* seems to work fine on linux, openbsd and freebsd */
1313         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1314                 die("openpty failed: %s\n", strerror(errno));
1315
1316         switch(pid = fork()) {
1317         case -1:
1318                 die("fork failed\n");
1319                 break;
1320         case 0:
1321                 close(iofd);
1322                 setsid(); /* create a new process group */
1323                 dup2(s, STDIN_FILENO);
1324                 dup2(s, STDOUT_FILENO);
1325                 dup2(s, STDERR_FILENO);
1326                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1327                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1328                 close(s);
1329                 close(m);
1330                 execsh();
1331                 break;
1332         default:
1333                 close(s);
1334                 cmdfd = m;
1335                 signal(SIGCHLD, sigchld);
1336                 break;
1337         }
1338 }
1339
1340 void
1341 ttyread(void) {
1342         static char buf[BUFSIZ];
1343         static int buflen = 0;
1344         char *ptr;
1345         int charsize; /* size of utf8 char in bytes */
1346         Rune unicodep;
1347         int ret;
1348
1349         /* append read bytes to unprocessed bytes */
1350         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1351                 die("Couldn't read from shell: %s\n", strerror(errno));
1352
1353         /* process every complete utf8 char */
1354         buflen += ret;
1355         ptr = buf;
1356         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1357                 tputc(unicodep);
1358                 ptr += charsize;
1359                 buflen -= charsize;
1360         }
1361
1362         /* keep any uncomplete utf8 char for the next call */
1363         memmove(buf, ptr, buflen);
1364 }
1365
1366 void
1367 ttywrite(const char *s, size_t n) {
1368         if(xwrite(cmdfd, s, n) == -1)
1369                 die("write error on tty: %s\n", strerror(errno));
1370 }
1371
1372 void
1373 ttysend(char *s, size_t n) {
1374         int len;
1375         Rune u;
1376
1377         ttywrite(s, n);
1378         if(IS_SET(MODE_ECHO))
1379                 while((len = utf8decode(s, &u, n)) > 0) {
1380                         techo(u);
1381                         n -= len;
1382                         s += len;
1383                 }
1384 }
1385
1386 void
1387 ttyresize(void) {
1388         struct winsize w;
1389
1390         w.ws_row = term.row;
1391         w.ws_col = term.col;
1392         w.ws_xpixel = xw.tw;
1393         w.ws_ypixel = xw.th;
1394         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1395                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1396 }
1397
1398 int
1399 tattrset(int attr) {
1400         int i, j;
1401
1402         for(i = 0; i < term.row-1; i++) {
1403                 for(j = 0; j < term.col-1; j++) {
1404                         if(term.line[i][j].mode & attr)
1405                                 return 1;
1406                 }
1407         }
1408
1409         return 0;
1410 }
1411
1412 void
1413 tsetdirt(int top, int bot) {
1414         int i;
1415
1416         LIMIT(top, 0, term.row-1);
1417         LIMIT(bot, 0, term.row-1);
1418
1419         for(i = top; i <= bot; i++)
1420                 term.dirty[i] = 1;
1421 }
1422
1423 void
1424 tsetdirtattr(int attr) {
1425         int i, j;
1426
1427         for(i = 0; i < term.row-1; i++) {
1428                 for(j = 0; j < term.col-1; j++) {
1429                         if(term.line[i][j].mode & attr) {
1430                                 tsetdirt(i, i);
1431                                 break;
1432                         }
1433                 }
1434         }
1435 }
1436
1437 void
1438 tfulldirt(void) {
1439         tsetdirt(0, term.row-1);
1440 }
1441
1442 void
1443 tcursor(int mode) {
1444         static TCursor c[2];
1445         bool alt = IS_SET(MODE_ALTSCREEN);
1446
1447         if(mode == CURSOR_SAVE) {
1448                 c[alt] = term.c;
1449         } else if(mode == CURSOR_LOAD) {
1450                 term.c = c[alt];
1451                 tmoveto(c[alt].x, c[alt].y);
1452         }
1453 }
1454
1455 void
1456 treset(void) {
1457         uint i;
1458
1459         term.c = (TCursor){{
1460                 .mode = ATTR_NULL,
1461                 .fg = defaultfg,
1462                 .bg = defaultbg
1463         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1464
1465         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1466         for(i = tabspaces; i < term.col; i += tabspaces)
1467                 term.tabs[i] = 1;
1468         term.top = 0;
1469         term.bot = term.row - 1;
1470         term.mode = MODE_WRAP;
1471         memset(term.trantbl, CS_USA, sizeof(term.trantbl));
1472         term.charset = 0;
1473
1474         for(i = 0; i < 2; i++) {
1475                 tmoveto(0, 0);
1476                 tcursor(CURSOR_SAVE);
1477                 tclearregion(0, 0, term.col-1, term.row-1);
1478                 tswapscreen();
1479         }
1480 }
1481
1482 void
1483 tnew(int col, int row) {
1484         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1485         tresize(col, row);
1486         term.numlock = 1;
1487
1488         treset();
1489 }
1490
1491 void
1492 tswapscreen(void) {
1493         Line *tmp = term.line;
1494
1495         term.line = term.alt;
1496         term.alt = tmp;
1497         term.mode ^= MODE_ALTSCREEN;
1498         tfulldirt();
1499 }
1500
1501 void
1502 tscrolldown(int orig, int n) {
1503         int i;
1504         Line temp;
1505
1506         LIMIT(n, 0, term.bot-orig+1);
1507
1508         tsetdirt(orig, term.bot-n);
1509         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1510
1511         for(i = term.bot; i >= orig+n; i--) {
1512                 temp = term.line[i];
1513                 term.line[i] = term.line[i-n];
1514                 term.line[i-n] = temp;
1515         }
1516
1517         selscroll(orig, n);
1518 }
1519
1520 void
1521 tscrollup(int orig, int n) {
1522         int i;
1523         Line temp;
1524
1525         LIMIT(n, 0, term.bot-orig+1);
1526
1527         tclearregion(0, orig, term.col-1, orig+n-1);
1528         tsetdirt(orig+n, term.bot);
1529
1530         for(i = orig; i <= term.bot-n; i++) {
1531                 temp = term.line[i];
1532                 term.line[i] = term.line[i+n];
1533                 term.line[i+n] = temp;
1534         }
1535
1536         selscroll(orig, -n);
1537 }
1538
1539 void
1540 selscroll(int orig, int n) {
1541         if(sel.ob.x == -1)
1542                 return;
1543
1544         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1545                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1546                         selclear(NULL);
1547                         return;
1548                 }
1549                 if(sel.type == SEL_RECTANGULAR) {
1550                         if(sel.ob.y < term.top)
1551                                 sel.ob.y = term.top;
1552                         if(sel.oe.y > term.bot)
1553                                 sel.oe.y = term.bot;
1554                 } else {
1555                         if(sel.ob.y < term.top) {
1556                                 sel.ob.y = term.top;
1557                                 sel.ob.x = 0;
1558                         }
1559                         if(sel.oe.y > term.bot) {
1560                                 sel.oe.y = term.bot;
1561                                 sel.oe.x = term.col;
1562                         }
1563                 }
1564                 selnormalize();
1565         }
1566 }
1567
1568 void
1569 tnewline(int first_col) {
1570         int y = term.c.y;
1571
1572         if(y == term.bot) {
1573                 tscrollup(term.top, 1);
1574         } else {
1575                 y++;
1576         }
1577         tmoveto(first_col ? 0 : term.c.x, y);
1578 }
1579
1580 void
1581 csiparse(void) {
1582         char *p = csiescseq.buf, *np;
1583         long int v;
1584
1585         csiescseq.narg = 0;
1586         if(*p == '?') {
1587                 csiescseq.priv = 1;
1588                 p++;
1589         }
1590
1591         csiescseq.buf[csiescseq.len] = '\0';
1592         while(p < csiescseq.buf+csiescseq.len) {
1593                 np = NULL;
1594                 v = strtol(p, &np, 10);
1595                 if(np == p)
1596                         v = 0;
1597                 if(v == LONG_MAX || v == LONG_MIN)
1598                         v = -1;
1599                 csiescseq.arg[csiescseq.narg++] = v;
1600                 p = np;
1601                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1602                         break;
1603                 p++;
1604         }
1605         csiescseq.mode[0] = *p++;
1606         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1607 }
1608
1609 /* for absolute user moves, when decom is set */
1610 void
1611 tmoveato(int x, int y) {
1612         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1613 }
1614
1615 void
1616 tmoveto(int x, int y) {
1617         int miny, maxy;
1618
1619         if(term.c.state & CURSOR_ORIGIN) {
1620                 miny = term.top;
1621                 maxy = term.bot;
1622         } else {
1623                 miny = 0;
1624                 maxy = term.row - 1;
1625         }
1626         term.c.state &= ~CURSOR_WRAPNEXT;
1627         term.c.x = LIMIT(x, 0, term.col-1);
1628         term.c.y = LIMIT(y, miny, maxy);
1629 }
1630
1631 void
1632 tsetchar(Rune u, Glyph *attr, int x, int y) {
1633         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1634                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1635                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1636                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1637                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1638                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1639                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1640                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1641                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1642         };
1643
1644         /*
1645          * The table is proudly stolen from rxvt.
1646          */
1647         if(term.trantbl[term.charset] == CS_GRAPHIC0 &&
1648            BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
1649                 utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
1650
1651         if(term.line[y][x].mode & ATTR_WIDE) {
1652                 if(x+1 < term.col) {
1653                         term.line[y][x+1].u = ' ';
1654                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1655                 }
1656         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1657                 term.line[y][x-1].u = ' ';
1658                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1659         }
1660
1661         term.dirty[y] = 1;
1662         term.line[y][x] = *attr;
1663         term.line[y][x].u = u;
1664 }
1665
1666 void
1667 tclearregion(int x1, int y1, int x2, int y2) {
1668         int x, y, temp;
1669         Glyph *gp;
1670
1671         if(x1 > x2)
1672                 temp = x1, x1 = x2, x2 = temp;
1673         if(y1 > y2)
1674                 temp = y1, y1 = y2, y2 = temp;
1675
1676         LIMIT(x1, 0, term.col-1);
1677         LIMIT(x2, 0, term.col-1);
1678         LIMIT(y1, 0, term.row-1);
1679         LIMIT(y2, 0, term.row-1);
1680
1681         for(y = y1; y <= y2; y++) {
1682                 term.dirty[y] = 1;
1683                 for(x = x1; x <= x2; x++) {
1684                         gp = &term.line[y][x];
1685                         if(selected(x, y))
1686                                 selclear(NULL);
1687                         gp->fg = term.c.attr.fg;
1688                         gp->bg = term.c.attr.bg;
1689                         gp->mode = 0;
1690                         gp->u = ' ';
1691                 }
1692         }
1693 }
1694
1695 void
1696 tdeletechar(int n) {
1697         int dst, src, size;
1698         Glyph *line;
1699
1700         LIMIT(n, 0, term.col - term.c.x);
1701
1702         dst = term.c.x;
1703         src = term.c.x + n;
1704         size = term.col - src;
1705         line = term.line[term.c.y];
1706
1707         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1708         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1709 }
1710
1711 void
1712 tinsertblank(int n) {
1713         int dst, src, size;
1714         Glyph *line;
1715
1716         LIMIT(n, 0, term.col - term.c.x);
1717
1718         dst = term.c.x + n;
1719         src = term.c.x;
1720         size = term.col - dst;
1721         line = term.line[term.c.y];
1722
1723         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1724         tclearregion(src, term.c.y, dst - 1, term.c.y);
1725 }
1726
1727 void
1728 tinsertblankline(int n) {
1729         if(BETWEEN(term.c.y, term.top, term.bot))
1730                 tscrolldown(term.c.y, n);
1731 }
1732
1733 void
1734 tdeleteline(int n) {
1735         if(BETWEEN(term.c.y, term.top, term.bot))
1736                 tscrollup(term.c.y, n);
1737 }
1738
1739 int32_t
1740 tdefcolor(int *attr, int *npar, int l) {
1741         int32_t idx = -1;
1742         uint r, g, b;
1743
1744         switch (attr[*npar + 1]) {
1745         case 2: /* direct color in RGB space */
1746                 if (*npar + 4 >= l) {
1747                         fprintf(stderr,
1748                                 "erresc(38): Incorrect number of parameters (%d)\n",
1749                                 *npar);
1750                         break;
1751                 }
1752                 r = attr[*npar + 2];
1753                 g = attr[*npar + 3];
1754                 b = attr[*npar + 4];
1755                 *npar += 4;
1756                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1757                         fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
1758                                 r, g, b);
1759                 else
1760                         idx = TRUECOLOR(r, g, b);
1761                 break;
1762         case 5: /* indexed color */
1763                 if (*npar + 2 >= l) {
1764                         fprintf(stderr,
1765                                 "erresc(38): Incorrect number of parameters (%d)\n",
1766                                 *npar);
1767                         break;
1768                 }
1769                 *npar += 2;
1770                 if(!BETWEEN(attr[*npar], 0, 255))
1771                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1772                 else
1773                         idx = attr[*npar];
1774                 break;
1775         case 0: /* implemented defined (only foreground) */
1776         case 1: /* transparent */
1777         case 3: /* direct color in CMY space */
1778         case 4: /* direct color in CMYK space */
1779         default:
1780                 fprintf(stderr,
1781                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1782                 break;
1783         }
1784
1785         return idx;
1786 }
1787
1788 void
1789 tsetattr(int *attr, int l) {
1790         int i;
1791         int32_t idx;
1792
1793         for(i = 0; i < l; i++) {
1794                 switch(attr[i]) {
1795                 case 0:
1796                         term.c.attr.mode &= ~(
1797                                 ATTR_BOLD       |
1798                                 ATTR_FAINT      |
1799                                 ATTR_ITALIC     |
1800                                 ATTR_UNDERLINE  |
1801                                 ATTR_BLINK      |
1802                                 ATTR_REVERSE    |
1803                                 ATTR_INVISIBLE  |
1804                                 ATTR_STRUCK     );
1805                         term.c.attr.fg = defaultfg;
1806                         term.c.attr.bg = defaultbg;
1807                         break;
1808                 case 1:
1809                         term.c.attr.mode |= ATTR_BOLD;
1810                         break;
1811                 case 2:
1812                         term.c.attr.mode |= ATTR_FAINT;
1813                         break;
1814                 case 3:
1815                         term.c.attr.mode |= ATTR_ITALIC;
1816                         break;
1817                 case 4:
1818                         term.c.attr.mode |= ATTR_UNDERLINE;
1819                         break;
1820                 case 5: /* slow blink */
1821                         /* FALLTHROUGH */
1822                 case 6: /* rapid blink */
1823                         term.c.attr.mode |= ATTR_BLINK;
1824                         break;
1825                 case 7:
1826                         term.c.attr.mode |= ATTR_REVERSE;
1827                         break;
1828                 case 8:
1829                         term.c.attr.mode |= ATTR_INVISIBLE;
1830                         break;
1831                 case 9:
1832                         term.c.attr.mode |= ATTR_STRUCK;
1833                         break;
1834                 case 22:
1835                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1836                         break;
1837                 case 23:
1838                         term.c.attr.mode &= ~ATTR_ITALIC;
1839                         break;
1840                 case 24:
1841                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1842                         break;
1843                 case 25:
1844                         term.c.attr.mode &= ~ATTR_BLINK;
1845                         break;
1846                 case 27:
1847                         term.c.attr.mode &= ~ATTR_REVERSE;
1848                         break;
1849                 case 28:
1850                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1851                         break;
1852                 case 29:
1853                         term.c.attr.mode &= ~ATTR_STRUCK;
1854                         break;
1855                 case 38:
1856                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1857                                 term.c.attr.fg = idx;
1858                         break;
1859                 case 39:
1860                         term.c.attr.fg = defaultfg;
1861                         break;
1862                 case 48:
1863                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1864                                 term.c.attr.bg = idx;
1865                         break;
1866                 case 49:
1867                         term.c.attr.bg = defaultbg;
1868                         break;
1869                 default:
1870                         if(BETWEEN(attr[i], 30, 37)) {
1871                                 term.c.attr.fg = attr[i] - 30;
1872                         } else if(BETWEEN(attr[i], 40, 47)) {
1873                                 term.c.attr.bg = attr[i] - 40;
1874                         } else if(BETWEEN(attr[i], 90, 97)) {
1875                                 term.c.attr.fg = attr[i] - 90 + 8;
1876                         } else if(BETWEEN(attr[i], 100, 107)) {
1877                                 term.c.attr.bg = attr[i] - 100 + 8;
1878                         } else {
1879                                 fprintf(stderr,
1880                                         "erresc(default): gfx attr %d unknown\n",
1881                                         attr[i]), csidump();
1882                         }
1883                         break;
1884                 }
1885         }
1886 }
1887
1888 void
1889 tsetscroll(int t, int b) {
1890         int temp;
1891
1892         LIMIT(t, 0, term.row-1);
1893         LIMIT(b, 0, term.row-1);
1894         if(t > b) {
1895                 temp = t;
1896                 t = b;
1897                 b = temp;
1898         }
1899         term.top = t;
1900         term.bot = b;
1901 }
1902
1903 void
1904 tsetmode(bool priv, bool set, int *args, int narg) {
1905         int *lim, mode;
1906         bool alt;
1907
1908         for(lim = args + narg; args < lim; ++args) {
1909                 if(priv) {
1910                         switch(*args) {
1911                         case 1: /* DECCKM -- Cursor key */
1912                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1913                                 break;
1914                         case 5: /* DECSCNM -- Reverse video */
1915                                 mode = term.mode;
1916                                 MODBIT(term.mode, set, MODE_REVERSE);
1917                                 if(mode != term.mode)
1918                                         redraw();
1919                                 break;
1920                         case 6: /* DECOM -- Origin */
1921                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1922                                 tmoveato(0, 0);
1923                                 break;
1924                         case 7: /* DECAWM -- Auto wrap */
1925                                 MODBIT(term.mode, set, MODE_WRAP);
1926                                 break;
1927                         case 0:  /* Error (IGNORED) */
1928                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1929                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1930                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1931                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1932                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1933                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1934                         case 42: /* DECNRCM -- National characters (IGNORED) */
1935                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1936                                 break;
1937                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1938                                 MODBIT(term.mode, !set, MODE_HIDE);
1939                                 break;
1940                         case 9:    /* X10 mouse compatibility mode */
1941                                 xsetpointermotion(0);
1942                                 MODBIT(term.mode, 0, MODE_MOUSE);
1943                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1944                                 break;
1945                         case 1000: /* 1000: report button press */
1946                                 xsetpointermotion(0);
1947                                 MODBIT(term.mode, 0, MODE_MOUSE);
1948                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1949                                 break;
1950                         case 1002: /* 1002: report motion on button press */
1951                                 xsetpointermotion(0);
1952                                 MODBIT(term.mode, 0, MODE_MOUSE);
1953                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1954                                 break;
1955                         case 1003: /* 1003: enable all mouse motions */
1956                                 xsetpointermotion(set);
1957                                 MODBIT(term.mode, 0, MODE_MOUSE);
1958                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1959                                 break;
1960                         case 1004: /* 1004: send focus events to tty */
1961                                 MODBIT(term.mode, set, MODE_FOCUS);
1962                                 break;
1963                         case 1006: /* 1006: extended reporting mode */
1964                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1965                                 break;
1966                         case 1034:
1967                                 MODBIT(term.mode, set, MODE_8BIT);
1968                                 break;
1969                         case 1049: /* swap screen & set/restore cursor as xterm */
1970                                 if (!allowaltscreen)
1971                                         break;
1972                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1973                                 /* FALLTHROUGH */
1974                         case 47: /* swap screen */
1975                         case 1047:
1976                                 if (!allowaltscreen)
1977                                         break;
1978                                 alt = IS_SET(MODE_ALTSCREEN);
1979                                 if(alt) {
1980                                         tclearregion(0, 0, term.col-1,
1981                                                         term.row-1);
1982                                 }
1983                                 if(set ^ alt) /* set is always 1 or 0 */
1984                                         tswapscreen();
1985                                 if(*args != 1049)
1986                                         break;
1987                                 /* FALLTHROUGH */
1988                         case 1048:
1989                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1990                                 break;
1991                         case 2004: /* 2004: bracketed paste mode */
1992                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1993                                 break;
1994                         /* Not implemented mouse modes. See comments there. */
1995                         case 1001: /* mouse highlight mode; can hang the
1996                                       terminal by design when implemented. */
1997                         case 1005: /* UTF-8 mouse mode; will confuse
1998                                       applications not supporting UTF-8
1999                                       and luit. */
2000                         case 1015: /* urxvt mangled mouse mode; incompatible
2001                                       and can be mistaken for other control
2002                                       codes. */
2003                         default:
2004                                 fprintf(stderr,
2005                                         "erresc: unknown private set/reset mode %d\n",
2006                                         *args);
2007                                 break;
2008                         }
2009                 } else {
2010                         switch(*args) {
2011                         case 0:  /* Error (IGNORED) */
2012                                 break;
2013                         case 2:  /* KAM -- keyboard action */
2014                                 MODBIT(term.mode, set, MODE_KBDLOCK);
2015                                 break;
2016                         case 4:  /* IRM -- Insertion-replacement */
2017                                 MODBIT(term.mode, set, MODE_INSERT);
2018                                 break;
2019                         case 12: /* SRM -- Send/Receive */
2020                                 MODBIT(term.mode, !set, MODE_ECHO);
2021                                 break;
2022                         case 20: /* LNM -- Linefeed/new line */
2023                                 MODBIT(term.mode, set, MODE_CRLF);
2024                                 break;
2025                         default:
2026                                 fprintf(stderr,
2027                                         "erresc: unknown set/reset mode %d\n",
2028                                         *args);
2029                                 break;
2030                         }
2031                 }
2032         }
2033 }
2034
2035 void
2036 csihandle(void) {
2037         char buf[40];
2038         int len;
2039
2040         switch(csiescseq.mode[0]) {
2041         default:
2042         unknown:
2043                 fprintf(stderr, "erresc: unknown csi ");
2044                 csidump();
2045                 /* die(""); */
2046                 break;
2047         case '@': /* ICH -- Insert <n> blank char */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tinsertblank(csiescseq.arg[0]);
2050                 break;
2051         case 'A': /* CUU -- Cursor <n> Up */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2054                 break;
2055         case 'B': /* CUD -- Cursor <n> Down */
2056         case 'e': /* VPR --Cursor <n> Down */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2059                 break;
2060         case 'i': /* MC -- Media Copy */
2061                 switch(csiescseq.arg[0]) {
2062                 case 0:
2063                         tdump();
2064                         break;
2065                 case 1:
2066                         tdumpline(term.c.y);
2067                         break;
2068                 case 2:
2069                         tdumpsel();
2070                         break;
2071                 case 4:
2072                         term.mode &= ~MODE_PRINT;
2073                         break;
2074                 case 5:
2075                         term.mode |= MODE_PRINT;
2076                         break;
2077                 }
2078                 break;
2079         case 'c': /* DA -- Device Attributes */
2080                 if(csiescseq.arg[0] == 0)
2081                         ttywrite(vtiden, sizeof(vtiden) - 1);
2082                 break;
2083         case 'C': /* CUF -- Cursor <n> Forward */
2084         case 'a': /* HPR -- Cursor <n> Forward */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2087                 break;
2088         case 'D': /* CUB -- Cursor <n> Backward */
2089                 DEFAULT(csiescseq.arg[0], 1);
2090                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2091                 break;
2092         case 'E': /* CNL -- Cursor <n> Down and first col */
2093                 DEFAULT(csiescseq.arg[0], 1);
2094                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2095                 break;
2096         case 'F': /* CPL -- Cursor <n> Up and first col */
2097                 DEFAULT(csiescseq.arg[0], 1);
2098                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2099                 break;
2100         case 'g': /* TBC -- Tabulation clear */
2101                 switch(csiescseq.arg[0]) {
2102                 case 0: /* clear current tab stop */
2103                         term.tabs[term.c.x] = 0;
2104                         break;
2105                 case 3: /* clear all the tabs */
2106                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2107                         break;
2108                 default:
2109                         goto unknown;
2110                 }
2111                 break;
2112         case 'G': /* CHA -- Move to <col> */
2113         case '`': /* HPA */
2114                 DEFAULT(csiescseq.arg[0], 1);
2115                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2116                 break;
2117         case 'H': /* CUP -- Move to <row> <col> */
2118         case 'f': /* HVP */
2119                 DEFAULT(csiescseq.arg[0], 1);
2120                 DEFAULT(csiescseq.arg[1], 1);
2121                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2122                 break;
2123         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2124                 DEFAULT(csiescseq.arg[0], 1);
2125                 tputtab(csiescseq.arg[0]);
2126                 break;
2127         case 'J': /* ED -- Clear screen */
2128                 selclear(NULL);
2129                 switch(csiescseq.arg[0]) {
2130                 case 0: /* below */
2131                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2132                         if(term.c.y < term.row-1) {
2133                                 tclearregion(0, term.c.y+1, term.col-1,
2134                                                 term.row-1);
2135                         }
2136                         break;
2137                 case 1: /* above */
2138                         if(term.c.y > 1)
2139                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2140                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2141                         break;
2142                 case 2: /* all */
2143                         tclearregion(0, 0, term.col-1, term.row-1);
2144                         break;
2145                 default:
2146                         goto unknown;
2147                 }
2148                 break;
2149         case 'K': /* EL -- Clear line */
2150                 switch(csiescseq.arg[0]) {
2151                 case 0: /* right */
2152                         tclearregion(term.c.x, term.c.y, term.col-1,
2153                                         term.c.y);
2154                         break;
2155                 case 1: /* left */
2156                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2157                         break;
2158                 case 2: /* all */
2159                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2160                         break;
2161                 }
2162                 break;
2163         case 'S': /* SU -- Scroll <n> line up */
2164                 DEFAULT(csiescseq.arg[0], 1);
2165                 tscrollup(term.top, csiescseq.arg[0]);
2166                 break;
2167         case 'T': /* SD -- Scroll <n> line down */
2168                 DEFAULT(csiescseq.arg[0], 1);
2169                 tscrolldown(term.top, csiescseq.arg[0]);
2170                 break;
2171         case 'L': /* IL -- Insert <n> blank lines */
2172                 DEFAULT(csiescseq.arg[0], 1);
2173                 tinsertblankline(csiescseq.arg[0]);
2174                 break;
2175         case 'l': /* RM -- Reset Mode */
2176                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2177                 break;
2178         case 'M': /* DL -- Delete <n> lines */
2179                 DEFAULT(csiescseq.arg[0], 1);
2180                 tdeleteline(csiescseq.arg[0]);
2181                 break;
2182         case 'X': /* ECH -- Erase <n> char */
2183                 DEFAULT(csiescseq.arg[0], 1);
2184                 tclearregion(term.c.x, term.c.y,
2185                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2186                 break;
2187         case 'P': /* DCH -- Delete <n> char */
2188                 DEFAULT(csiescseq.arg[0], 1);
2189                 tdeletechar(csiescseq.arg[0]);
2190                 break;
2191         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2192                 DEFAULT(csiescseq.arg[0], 1);
2193                 tputtab(-csiescseq.arg[0]);
2194                 break;
2195         case 'd': /* VPA -- Move to <row> */
2196                 DEFAULT(csiescseq.arg[0], 1);
2197                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2198                 break;
2199         case 'h': /* SM -- Set terminal mode */
2200                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2201                 break;
2202         case 'm': /* SGR -- Terminal attribute (color) */
2203                 tsetattr(csiescseq.arg, csiescseq.narg);
2204                 break;
2205         case 'n': /* DSR – Device Status Report (cursor position) */
2206                 if (csiescseq.arg[0] == 6) {
2207                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2208                                         term.c.y+1, term.c.x+1);
2209                         ttywrite(buf, len);
2210                 }
2211                 break;
2212         case 'r': /* DECSTBM -- Set Scrolling Region */
2213                 if(csiescseq.priv) {
2214                         goto unknown;
2215                 } else {
2216                         DEFAULT(csiescseq.arg[0], 1);
2217                         DEFAULT(csiescseq.arg[1], term.row);
2218                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2219                         tmoveato(0, 0);
2220                 }
2221                 break;
2222         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2223                 tcursor(CURSOR_SAVE);
2224                 break;
2225         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2226                 tcursor(CURSOR_LOAD);
2227                 break;
2228         case ' ':
2229                 switch (csiescseq.mode[1]) {
2230                         case 'q': /* DECSCUSR -- Set Cursor Style */
2231                                 DEFAULT(csiescseq.arg[0], 1);
2232                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2233                                         goto unknown;
2234                                 }
2235                                 xw.cursor = csiescseq.arg[0];
2236                                 break;
2237                         default:
2238                                 goto unknown;
2239                 }
2240                 break;
2241         }
2242 }
2243
2244 void
2245 csidump(void) {
2246         int i;
2247         uint c;
2248
2249         printf("ESC[");
2250         for(i = 0; i < csiescseq.len; i++) {
2251                 c = csiescseq.buf[i] & 0xff;
2252                 if(isprint(c)) {
2253                         putchar(c);
2254                 } else if(c == '\n') {
2255                         printf("(\\n)");
2256                 } else if(c == '\r') {
2257                         printf("(\\r)");
2258                 } else if(c == 0x1b) {
2259                         printf("(\\e)");
2260                 } else {
2261                         printf("(%02x)", c);
2262                 }
2263         }
2264         putchar('\n');
2265 }
2266
2267 void
2268 csireset(void) {
2269         memset(&csiescseq, 0, sizeof(csiescseq));
2270 }
2271
2272 void
2273 strhandle(void) {
2274         char *p = NULL;
2275         int j, narg, par;
2276
2277         term.esc &= ~(ESC_STR_END|ESC_STR);
2278         strparse();
2279         par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
2280
2281         switch(strescseq.type) {
2282         case ']': /* OSC -- Operating System Command */
2283                 switch(par) {
2284                 case 0:
2285                 case 1:
2286                 case 2:
2287                         if(narg > 1)
2288                                 xsettitle(strescseq.args[1]);
2289                         return;
2290                 case 4: /* color set */
2291                         if(narg < 3)
2292                                 break;
2293                         p = strescseq.args[2];
2294                         /* FALLTHROUGH */
2295                 case 104: /* color reset, here p = NULL */
2296                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2297                         if(xsetcolorname(j, p)) {
2298                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2299                         } else {
2300                                 /*
2301                                  * TODO if defaultbg color is changed, borders
2302                                  * are dirty
2303                                  */
2304                                 redraw();
2305                         }
2306                         return;
2307                 }
2308                 break;
2309         case 'k': /* old title set compatibility */
2310                 xsettitle(strescseq.args[0]);
2311                 return;
2312         case 'P': /* DCS -- Device Control String */
2313         case '_': /* APC -- Application Program Command */
2314         case '^': /* PM -- Privacy Message */
2315                 return;
2316         }
2317
2318         fprintf(stderr, "erresc: unknown str ");
2319         strdump();
2320 }
2321
2322 void
2323 strparse(void) {
2324         int c;
2325         char *p = strescseq.buf;
2326
2327         strescseq.narg = 0;
2328         strescseq.buf[strescseq.len] = '\0';
2329
2330         if(*p == '\0')
2331                 return;
2332
2333         while(strescseq.narg < STR_ARG_SIZ) {
2334                 strescseq.args[strescseq.narg++] = p;
2335                 while((c = *p) != ';' && c != '\0')
2336                         ++p;
2337                 if(c == '\0')
2338                         return;
2339                 *p++ = '\0';
2340         }
2341 }
2342
2343 void
2344 strdump(void) {
2345         int i;
2346         uint c;
2347
2348         printf("ESC%c", strescseq.type);
2349         for(i = 0; i < strescseq.len; i++) {
2350                 c = strescseq.buf[i] & 0xff;
2351                 if(c == '\0') {
2352                         return;
2353                 } else if(isprint(c)) {
2354                         putchar(c);
2355                 } else if(c == '\n') {
2356                         printf("(\\n)");
2357                 } else if(c == '\r') {
2358                         printf("(\\r)");
2359                 } else if(c == 0x1b) {
2360                         printf("(\\e)");
2361                 } else {
2362                         printf("(%02x)", c);
2363                 }
2364         }
2365         printf("ESC\\\n");
2366 }
2367
2368 void
2369 strreset(void) {
2370         memset(&strescseq, 0, sizeof(strescseq));
2371 }
2372
2373 void
2374 tprinter(char *s, size_t len) {
2375         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2376                 fprintf(stderr, "Error writing in %s:%s\n",
2377                         opt_io, strerror(errno));
2378                 close(iofd);
2379                 iofd = -1;
2380         }
2381 }
2382
2383 void
2384 toggleprinter(const Arg *arg) {
2385         term.mode ^= MODE_PRINT;
2386 }
2387
2388 void
2389 printscreen(const Arg *arg) {
2390         tdump();
2391 }
2392
2393 void
2394 printsel(const Arg *arg) {
2395         tdumpsel();
2396 }
2397
2398 void
2399 tdumpsel(void) {
2400         char *ptr;
2401
2402         if((ptr = getsel())) {
2403                 tprinter(ptr, strlen(ptr));
2404                 free(ptr);
2405         }
2406 }
2407
2408 void
2409 tdumpline(int n) {
2410         char buf[UTF_SIZ];
2411         Glyph *bp, *end;
2412
2413         bp = &term.line[n][0];
2414         end = &bp[MIN(tlinelen(n), term.col) - 1];
2415         if(bp != end || bp->u != ' ') {
2416                 for( ;bp <= end; ++bp)
2417                         tprinter(buf, utf8encode(bp->u, buf));
2418         }
2419         tprinter("\n", 1);
2420 }
2421
2422 void
2423 tdump(void) {
2424         int i;
2425
2426         for(i = 0; i < term.row; ++i)
2427                 tdumpline(i);
2428 }
2429
2430 void
2431 tputtab(int n) {
2432         uint x = term.c.x;
2433
2434         if(n > 0) {
2435                 while(x < term.col && n--)
2436                         for(++x; x < term.col && !term.tabs[x]; ++x)
2437                                 /* nothing */ ;
2438         } else if(n < 0) {
2439                 while(x > 0 && n++)
2440                         for(--x; x > 0 && !term.tabs[x]; --x)
2441                                 /* nothing */ ;
2442         }
2443         term.c.x = LIMIT(x, 0, term.col-1);
2444 }
2445
2446 void
2447 techo(Rune u) {
2448         if(ISCONTROL(u)) { /* control code */
2449                 if(u & 0x80) {
2450                         u &= 0x7f;
2451                         tputc('^');
2452                         tputc('[');
2453                 } else if(u != '\n' && u != '\r' && u != '\t') {
2454                         u ^= 0x40;
2455                         tputc('^');
2456                 }
2457         }
2458         tputc(u);
2459 }
2460
2461 void
2462 tdeftran(char ascii) {
2463         static char cs[] = "0B";
2464         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2465         char *p;
2466
2467         if((p = strchr(cs, ascii)) == NULL) {
2468                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2469         } else {
2470                 term.trantbl[term.icharset] = vcs[p - cs];
2471         }
2472 }
2473
2474 void
2475 tdectest(char c) {
2476         int x, y;
2477
2478         if(c == '8') { /* DEC screen alignment test. */
2479                 for(x = 0; x < term.col; ++x) {
2480                         for(y = 0; y < term.row; ++y)
2481                                 tsetchar('E', &term.c.attr, x, y);
2482                 }
2483         }
2484 }
2485
2486 void
2487 tstrsequence(uchar c) {
2488         switch (c) {
2489         case 0x90:   /* DCS -- Device Control String */
2490                 c = 'P';
2491                 break;
2492         case 0x9f:   /* APC -- Application Program Command */
2493                 c = '_';
2494                 break;
2495         case 0x9e:   /* PM -- Privacy Message */
2496                 c = '^';
2497                 break;
2498         case 0x9d:   /* OSC -- Operating System Command */
2499                 c = ']';
2500                 break;
2501         }
2502         strreset();
2503         strescseq.type = c;
2504         term.esc |= ESC_STR;
2505 }
2506
2507 void
2508 tcontrolcode(uchar ascii) {
2509         switch(ascii) {
2510         case '\t':   /* HT */
2511                 tputtab(1);
2512                 return;
2513         case '\b':   /* BS */
2514                 tmoveto(term.c.x-1, term.c.y);
2515                 return;
2516         case '\r':   /* CR */
2517                 tmoveto(0, term.c.y);
2518                 return;
2519         case '\f':   /* LF */
2520         case '\v':   /* VT */
2521         case '\n':   /* LF */
2522                 /* go to first col if the mode is set */
2523                 tnewline(IS_SET(MODE_CRLF));
2524                 return;
2525         case '\a':   /* BEL */
2526                 if(term.esc & ESC_STR_END) {
2527                         /* backwards compatibility to xterm */
2528                         strhandle();
2529                 } else {
2530                         if(!(xw.state & WIN_FOCUSED))
2531                                 xseturgency(1);
2532                         if (bellvolume)
2533                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2534                 }
2535                 break;
2536         case '\033': /* ESC */
2537                 csireset();
2538                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2539                 term.esc |= ESC_START;
2540                 return;
2541         case '\016': /* SO (LS1 -- Locking shift 1) */
2542         case '\017': /* SI (LS0 -- Locking shift 0) */
2543                 term.charset = 1 - (ascii - '\016');
2544                 return;
2545         case '\032': /* SUB */
2546                 tsetchar('?', &term.c.attr, term.c.x, term.c.y);
2547         case '\030': /* CAN */
2548                 csireset();
2549                 break;
2550         case '\005': /* ENQ (IGNORED) */
2551         case '\000': /* NUL (IGNORED) */
2552         case '\021': /* XON (IGNORED) */
2553         case '\023': /* XOFF (IGNORED) */
2554         case 0177:   /* DEL (IGNORED) */
2555                 return;
2556         case 0x84:   /* TODO: IND */
2557                 break;
2558         case 0x85:   /* NEL -- Next line */
2559                 tnewline(1); /* always go to first col */
2560                 break;
2561         case 0x88:   /* HTS -- Horizontal tab stop */
2562                 term.tabs[term.c.x] = 1;
2563                 break;
2564         case 0x8d:   /* TODO: RI */
2565         case 0x8e:   /* TODO: SS2 */
2566         case 0x8f:   /* TODO: SS3 */
2567         case 0x98:   /* TODO: SOS */
2568                 break;
2569         case 0x9a:   /* DECID -- Identify Terminal */
2570                 ttywrite(vtiden, sizeof(vtiden) - 1);
2571                 break;
2572         case 0x9b:   /* TODO: CSI */
2573         case 0x9c:   /* TODO: ST */
2574                 break;
2575         case 0x90:   /* DCS -- Device Control String */
2576         case 0x9f:   /* APC -- Application Program Command */
2577         case 0x9e:   /* PM -- Privacy Message */
2578         case 0x9d:   /* OSC -- Operating System Command */
2579                 tstrsequence(ascii);
2580                 return;
2581         }
2582         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2583         term.esc &= ~(ESC_STR_END|ESC_STR);
2584 }
2585
2586 /*
2587  * returns 1 when the sequence is finished and it hasn't to read
2588  * more characters for this sequence, otherwise 0
2589  */
2590 int
2591 eschandle(uchar ascii) {
2592         switch(ascii) {
2593         case '[':
2594                 term.esc |= ESC_CSI;
2595                 return 0;
2596         case '#':
2597                 term.esc |= ESC_TEST;
2598                 return 0;
2599         case 'P': /* DCS -- Device Control String */
2600         case '_': /* APC -- Application Program Command */
2601         case '^': /* PM -- Privacy Message */
2602         case ']': /* OSC -- Operating System Command */
2603         case 'k': /* old title set compatibility */
2604                 tstrsequence(ascii);
2605                 return 0;
2606         case 'n': /* LS2 -- Locking shift 2 */
2607         case 'o': /* LS3 -- Locking shift 3 */
2608                 term.charset = 2 + (ascii - 'n');
2609                 break;
2610         case '(': /* GZD4 -- set primary charset G0 */
2611         case ')': /* G1D4 -- set secondary charset G1 */
2612         case '*': /* G2D4 -- set tertiary charset G2 */
2613         case '+': /* G3D4 -- set quaternary charset G3 */
2614                 term.icharset = ascii - '(';
2615                 term.esc |= ESC_ALTCHARSET;
2616                 return 0;
2617         case 'D': /* IND -- Linefeed */
2618                 if(term.c.y == term.bot) {
2619                         tscrollup(term.top, 1);
2620                 } else {
2621                         tmoveto(term.c.x, term.c.y+1);
2622                 }
2623                 break;
2624         case 'E': /* NEL -- Next line */
2625                 tnewline(1); /* always go to first col */
2626                 break;
2627         case 'H': /* HTS -- Horizontal tab stop */
2628                 term.tabs[term.c.x] = 1;
2629                 break;
2630         case 'M': /* RI -- Reverse index */
2631                 if(term.c.y == term.top) {
2632                         tscrolldown(term.top, 1);
2633                 } else {
2634                         tmoveto(term.c.x, term.c.y-1);
2635                 }
2636                 break;
2637         case 'Z': /* DECID -- Identify Terminal */
2638                 ttywrite(vtiden, sizeof(vtiden) - 1);
2639                 break;
2640         case 'c': /* RIS -- Reset to inital state */
2641                 treset();
2642                 xresettitle();
2643                 xloadcols();
2644                 break;
2645         case '=': /* DECPAM -- Application keypad */
2646                 term.mode |= MODE_APPKEYPAD;
2647                 break;
2648         case '>': /* DECPNM -- Normal keypad */
2649                 term.mode &= ~MODE_APPKEYPAD;
2650                 break;
2651         case '7': /* DECSC -- Save Cursor */
2652                 tcursor(CURSOR_SAVE);
2653                 break;
2654         case '8': /* DECRC -- Restore Cursor */
2655                 tcursor(CURSOR_LOAD);
2656                 break;
2657         case '\\': /* ST -- String Terminator */
2658                 if(term.esc & ESC_STR_END)
2659                         strhandle();
2660                 break;
2661         default:
2662                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2663                         (uchar) ascii, isprint(ascii)? ascii:'.');
2664                 break;
2665         }
2666         return 1;
2667 }
2668
2669 void
2670 tputc(Rune u) {
2671         char c[UTF_SIZ];
2672         bool control;
2673         int width, len;
2674         Glyph *gp;
2675
2676         len = utf8encode(u, c);
2677         if((width = wcwidth(u)) == -1) {
2678                 memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
2679                 width = 1;
2680         }
2681
2682         if(IS_SET(MODE_PRINT))
2683                 tprinter(c, len);
2684         control = ISCONTROL(u);
2685
2686         /*
2687          * STR sequence must be checked before anything else
2688          * because it uses all following characters until it
2689          * receives a ESC, a SUB, a ST or any other C1 control
2690          * character.
2691          */
2692         if(term.esc & ESC_STR) {
2693                 if(u == '\a' || u == 030 || u == 032 || u == 033 ||
2694                    ISCONTROLC1(u)) {
2695                         term.esc &= ~(ESC_START|ESC_STR);
2696                         term.esc |= ESC_STR_END;
2697                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2698                         memmove(&strescseq.buf[strescseq.len], c, len);
2699                         strescseq.len += len;
2700                         return;
2701                 } else {
2702                 /*
2703                  * Here is a bug in terminals. If the user never sends
2704                  * some code to stop the str or esc command, then st
2705                  * will stop responding. But this is better than
2706                  * silently failing with unknown characters. At least
2707                  * then users will report back.
2708                  *
2709                  * In the case users ever get fixed, here is the code:
2710                  */
2711                 /*
2712                  * term.esc = 0;
2713                  * strhandle();
2714                  */
2715                         return;
2716                 }
2717         }
2718
2719         /*
2720          * Actions of control codes must be performed as soon they arrive
2721          * because they can be embedded inside a control sequence, and
2722          * they must not cause conflicts with sequences.
2723          */
2724         if(control) {
2725                 tcontrolcode(u);
2726                 /*
2727                  * control codes are not shown ever
2728                  */
2729                 return;
2730         } else if(term.esc & ESC_START) {
2731                 if(term.esc & ESC_CSI) {
2732                         csiescseq.buf[csiescseq.len++] = u;
2733                         if(BETWEEN(u, 0x40, 0x7E)
2734                                         || csiescseq.len >= \
2735                                         sizeof(csiescseq.buf)-1) {
2736                                 term.esc = 0;
2737                                 csiparse();
2738                                 csihandle();
2739                         }
2740                         return;
2741                 } else if(term.esc & ESC_ALTCHARSET) {
2742                         tdeftran(u);
2743                 } else if(term.esc & ESC_TEST) {
2744                         tdectest(u);
2745                 } else {
2746                         if (!eschandle(u))
2747                                 return;
2748                         /* sequence already finished */
2749                 }
2750                 term.esc = 0;
2751                 /*
2752                  * All characters which form part of a sequence are not
2753                  * printed
2754                  */
2755                 return;
2756         }
2757         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2758                 selclear(NULL);
2759
2760         gp = &term.line[term.c.y][term.c.x];
2761         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2762                 gp->mode |= ATTR_WRAP;
2763                 tnewline(1);
2764                 gp = &term.line[term.c.y][term.c.x];
2765         }
2766
2767         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2768                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2769
2770         if(term.c.x+width > term.col) {
2771                 tnewline(1);
2772                 gp = &term.line[term.c.y][term.c.x];
2773         }
2774
2775         tsetchar(u, &term.c.attr, term.c.x, term.c.y);
2776
2777         if(width == 2) {
2778                 gp->mode |= ATTR_WIDE;
2779                 if(term.c.x+1 < term.col) {
2780                         gp[1].u = '\0';
2781                         gp[1].mode = ATTR_WDUMMY;
2782                 }
2783         }
2784         if(term.c.x+width < term.col) {
2785                 tmoveto(term.c.x+width, term.c.y);
2786         } else {
2787                 term.c.state |= CURSOR_WRAPNEXT;
2788         }
2789 }
2790
2791 void
2792 tresize(int col, int row) {
2793         int i;
2794         int minrow = MIN(row, term.row);
2795         int mincol = MIN(col, term.col);
2796         bool *bp;
2797         TCursor c;
2798
2799         if(col < 1 || row < 1) {
2800                 fprintf(stderr,
2801                         "tresize: error resizing to %dx%d\n", col, row);
2802                 return;
2803         }
2804
2805         /*
2806          * slide screen to keep cursor where we expect it -
2807          * tscrollup would work here, but we can optimize to
2808          * memmove because we're freeing the earlier lines
2809          */
2810         for(i = 0; i <= term.c.y - row; i++) {
2811                 free(term.line[i]);
2812                 free(term.alt[i]);
2813         }
2814         /* ensure that both src and dst are not NULL */
2815         if (i > 0) {
2816                 memmove(term.line, term.line + i, row * sizeof(Line));
2817                 memmove(term.alt, term.alt + i, row * sizeof(Line));
2818         }
2819         for(i += row; i < term.row; i++) {
2820                 free(term.line[i]);
2821                 free(term.alt[i]);
2822         }
2823
2824         /* resize to new width */
2825         term.specbuf = xrealloc(term.specbuf, col * sizeof(XftGlyphFontSpec));
2826
2827         /* resize to new height */
2828         term.line = xrealloc(term.line, row * sizeof(Line));
2829         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2830         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2831         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2832
2833         /* resize each row to new width, zero-pad if needed */
2834         for(i = 0; i < minrow; i++) {
2835                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2836                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2837         }
2838
2839         /* allocate any new rows */
2840         for(/* i == minrow */; i < row; i++) {
2841                 term.line[i] = xmalloc(col * sizeof(Glyph));
2842                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2843         }
2844         if(col > term.col) {
2845                 bp = term.tabs + term.col;
2846
2847                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2848                 while(--bp > term.tabs && !*bp)
2849                         /* nothing */ ;
2850                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2851                         *bp = 1;
2852         }
2853         /* update terminal size */
2854         term.col = col;
2855         term.row = row;
2856         /* reset scrolling region */
2857         tsetscroll(0, row-1);
2858         /* make use of the LIMIT in tmoveto */
2859         tmoveto(term.c.x, term.c.y);
2860         /* Clearing both screens (it makes dirty all lines) */
2861         c = term.c;
2862         for(i = 0; i < 2; i++) {
2863                 if(mincol < col && 0 < minrow) {
2864                         tclearregion(mincol, 0, col - 1, minrow - 1);
2865                 }
2866                 if(0 < col && minrow < row) {
2867                         tclearregion(0, minrow, col - 1, row - 1);
2868                 }
2869                 tswapscreen();
2870                 tcursor(CURSOR_LOAD);
2871         }
2872         term.c = c;
2873 }
2874
2875 void
2876 xresize(int col, int row) {
2877         xw.tw = MAX(1, col * xw.cw);
2878         xw.th = MAX(1, row * xw.ch);
2879
2880         XFreePixmap(xw.dpy, xw.buf);
2881         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2882                         DefaultDepth(xw.dpy, xw.scr));
2883         XftDrawChange(xw.draw, xw.buf);
2884         xclear(0, 0, xw.w, xw.h);
2885 }
2886
2887 ushort
2888 sixd_to_16bit(int x) {
2889         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2890 }
2891
2892 bool
2893 xloadcolor(int i, const char *name, Color *ncolor) {
2894         XRenderColor color = { .alpha = 0xffff };
2895
2896         if(!name) {
2897                 if(BETWEEN(i, 16, 255)) { /* 256 color */
2898                         if(i < 6*6*6+16) { /* same colors as xterm */
2899                                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2900                                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2901                                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2902                         } else { /* greyscale */
2903                                 color.red = 0x0808 + 0x0a0a * (i - (6*6*6+16));
2904                                 color.green = color.blue = color.red;
2905                         }
2906                         return XftColorAllocValue(xw.dpy, xw.vis,
2907                                                   xw.cmap, &color, ncolor);
2908                 } else
2909                         name = colorname[i];
2910         }
2911         return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
2912 }
2913
2914 void
2915 xloadcols(void) {
2916         int i;
2917         static bool loaded;
2918         Color *cp;
2919
2920         if(loaded) {
2921                 for (cp = dc.col; cp < &dc.col[LEN(dc.col)]; ++cp)
2922                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2923         }
2924
2925         for(i = 0; i < LEN(dc.col); i++)
2926                 if(!xloadcolor(i, NULL, &dc.col[i])) {
2927                         if(colorname[i])
2928                                 die("Could not allocate color '%s'\n", colorname[i]);
2929                         else
2930                                 die("Could not allocate color %d\n", i);
2931                 }
2932         loaded = true;
2933 }
2934
2935 int
2936 xsetcolorname(int x, const char *name) {
2937         Color ncolor;
2938
2939         if(!BETWEEN(x, 0, LEN(dc.col)))
2940                 return 1;
2941
2942
2943         if(!xloadcolor(x, name, &ncolor))
2944                 return 1;
2945
2946         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2947         dc.col[x] = ncolor;
2948         return 0;
2949 }
2950
2951 void
2952 xtermclear(int col1, int row1, int col2, int row2) {
2953         XftDrawRect(xw.draw,
2954                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2955                         borderpx + col1 * xw.cw,
2956                         borderpx + row1 * xw.ch,
2957                         (col2-col1+1) * xw.cw,
2958                         (row2-row1+1) * xw.ch);
2959 }
2960
2961 /*
2962  * Absolute coordinates.
2963  */
2964 void
2965 xclear(int x1, int y1, int x2, int y2) {
2966         XftDrawRect(xw.draw,
2967                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2968                         x1, y1, x2-x1, y2-y1);
2969 }
2970
2971 void
2972 xhints(void) {
2973         XClassHint class = {opt_class ? opt_class : termname, termname};
2974         XWMHints wm = {.flags = InputHint, .input = 1};
2975         XSizeHints *sizeh = NULL;
2976
2977         sizeh = XAllocSizeHints();
2978
2979         sizeh->flags = PSize | PResizeInc | PBaseSize;
2980         sizeh->height = xw.h;
2981         sizeh->width = xw.w;
2982         sizeh->height_inc = xw.ch;
2983         sizeh->width_inc = xw.cw;
2984         sizeh->base_height = 2 * borderpx;
2985         sizeh->base_width = 2 * borderpx;
2986         if(xw.isfixed == True) {
2987                 sizeh->flags |= PMaxSize | PMinSize;
2988                 sizeh->min_width = sizeh->max_width = xw.w;
2989                 sizeh->min_height = sizeh->max_height = xw.h;
2990         }
2991         if(xw.gm & (XValue|YValue)) {
2992                 sizeh->flags |= USPosition | PWinGravity;
2993                 sizeh->x = xw.l;
2994                 sizeh->y = xw.t;
2995                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2996         }
2997
2998         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2999                         &class);
3000         XFree(sizeh);
3001 }
3002
3003 int
3004 xgeommasktogravity(int mask) {
3005         switch(mask & (XNegative|YNegative)) {
3006         case 0:
3007                 return NorthWestGravity;
3008         case XNegative:
3009                 return NorthEastGravity;
3010         case YNegative:
3011                 return SouthWestGravity;
3012         }
3013         return SouthEastGravity;
3014 }
3015
3016 int
3017 xloadfont(Font *f, FcPattern *pattern) {
3018         FcPattern *match;
3019         FcResult result;
3020
3021         match = FcFontMatch(NULL, pattern, &result);
3022         if(!match)
3023                 return 1;
3024
3025         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3026                 FcPatternDestroy(match);
3027                 return 1;
3028         }
3029
3030         f->set = NULL;
3031         f->pattern = FcPatternDuplicate(pattern);
3032
3033         f->ascent = f->match->ascent;
3034         f->descent = f->match->descent;
3035         f->lbearing = 0;
3036         f->rbearing = f->match->max_advance_width;
3037
3038         f->height = f->ascent + f->descent;
3039         f->width = f->lbearing + f->rbearing;
3040
3041         return 0;
3042 }
3043
3044 void
3045 xloadfonts(char *fontstr, double fontsize) {
3046         FcPattern *pattern;
3047         FcResult r_sz, r_psz;
3048         double fontval;
3049         float ceilf(float);
3050
3051         if(fontstr[0] == '-') {
3052                 pattern = XftXlfdParse(fontstr, False, False);
3053         } else {
3054                 pattern = FcNameParse((FcChar8 *)fontstr);
3055         }
3056
3057         if(!pattern)
3058                 die("st: can't open font %s\n", fontstr);
3059
3060         if(fontsize > 1) {
3061                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3062                 FcPatternDel(pattern, FC_SIZE);
3063                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3064                 usedfontsize = fontsize;
3065         } else {
3066                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3067                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3068                 if(r_psz == FcResultMatch) {
3069                         usedfontsize = fontval;
3070                 } else if(r_sz == FcResultMatch) {
3071                         usedfontsize = -1;
3072                 } else {
3073                         /*
3074                          * Default font size is 12, if none given. This is to
3075                          * have a known usedfontsize value.
3076                          */
3077                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3078                         usedfontsize = 12;
3079                 }
3080                 defaultfontsize = usedfontsize;
3081         }
3082
3083         FcConfigSubstitute(0, pattern, FcMatchPattern);
3084         FcDefaultSubstitute(pattern);
3085
3086         if(xloadfont(&dc.font, pattern))
3087                 die("st: can't open font %s\n", fontstr);
3088
3089         if(usedfontsize < 0) {
3090                 FcPatternGetDouble(dc.font.match->pattern,
3091                                    FC_PIXEL_SIZE, 0, &fontval);
3092                 usedfontsize = fontval;
3093                 if(fontsize == 0)
3094                         defaultfontsize = fontval;
3095         }
3096
3097         /* Setting character width and height. */
3098         xw.cw = ceilf(dc.font.width * cwscale);
3099         xw.ch = ceilf(dc.font.height * chscale);
3100
3101         FcPatternDel(pattern, FC_SLANT);
3102         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3103         if(xloadfont(&dc.ifont, pattern))
3104                 die("st: can't open font %s\n", fontstr);
3105
3106         FcPatternDel(pattern, FC_WEIGHT);
3107         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3108         if(xloadfont(&dc.ibfont, pattern))
3109                 die("st: can't open font %s\n", fontstr);
3110
3111         FcPatternDel(pattern, FC_SLANT);
3112         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3113         if(xloadfont(&dc.bfont, pattern))
3114                 die("st: can't open font %s\n", fontstr);
3115
3116         FcPatternDestroy(pattern);
3117 }
3118
3119 void
3120 xunloadfont(Font *f) {
3121         XftFontClose(xw.dpy, f->match);
3122         FcPatternDestroy(f->pattern);
3123         if(f->set)
3124                 FcFontSetDestroy(f->set);
3125 }
3126
3127 void
3128 xunloadfonts(void) {
3129         /* Free the loaded fonts in the font cache.  */
3130         while(frclen > 0)
3131                 XftFontClose(xw.dpy, frc[--frclen].font);
3132
3133         xunloadfont(&dc.font);
3134         xunloadfont(&dc.bfont);
3135         xunloadfont(&dc.ifont);
3136         xunloadfont(&dc.ibfont);
3137 }
3138
3139 void
3140 xzoom(const Arg *arg) {
3141         Arg larg;
3142
3143         larg.i = usedfontsize + arg->i;
3144         xzoomabs(&larg);
3145 }
3146
3147 void
3148 xzoomabs(const Arg *arg) {
3149         xunloadfonts();
3150         xloadfonts(usedfont, arg->i);
3151         cresize(0, 0);
3152         redraw();
3153         xhints();
3154 }
3155
3156 void
3157 xzoomreset(const Arg *arg) {
3158         Arg larg;
3159
3160         if(defaultfontsize > 0) {
3161                 larg.i = defaultfontsize;
3162                 xzoomabs(&larg);
3163         }
3164 }
3165
3166 void
3167 xinit(void) {
3168         XGCValues gcvalues;
3169         Cursor cursor;
3170         Window parent;
3171         pid_t thispid = getpid();
3172
3173         if(!(xw.dpy = XOpenDisplay(NULL)))
3174                 die("Can't open display\n");
3175         xw.scr = XDefaultScreen(xw.dpy);
3176         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3177
3178         /* font */
3179         if(!FcInit())
3180                 die("Could not init fontconfig.\n");
3181
3182         usedfont = (opt_font == NULL)? font : opt_font;
3183         xloadfonts(usedfont, 0);
3184
3185         /* colors */
3186         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3187         xloadcols();
3188
3189         /* adjust fixed window geometry */
3190         xw.w = 2 * borderpx + term.col * xw.cw;
3191         xw.h = 2 * borderpx + term.row * xw.ch;
3192         if(xw.gm & XNegative)
3193                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3194         if(xw.gm & YNegative)
3195                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3196
3197         /* Events */
3198         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3199         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3200         xw.attrs.bit_gravity = NorthWestGravity;
3201         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3202                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3203                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3204         xw.attrs.colormap = xw.cmap;
3205
3206         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3207                 parent = XRootWindow(xw.dpy, xw.scr);
3208         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3209                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3210                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3211                         | CWEventMask | CWColormap, &xw.attrs);
3212
3213         memset(&gcvalues, 0, sizeof(gcvalues));
3214         gcvalues.graphics_exposures = False;
3215         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3216                         &gcvalues);
3217         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3218                         DefaultDepth(xw.dpy, xw.scr));
3219         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3220         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3221
3222         /* Xft rendering context */
3223         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3224
3225         /* input methods */
3226         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3227                 XSetLocaleModifiers("@im=local");
3228                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3229                         XSetLocaleModifiers("@im=");
3230                         if((xw.xim = XOpenIM(xw.dpy,
3231                                         NULL, NULL, NULL)) == NULL) {
3232                                 die("XOpenIM failed. Could not open input"
3233                                         " device.\n");
3234                         }
3235                 }
3236         }
3237         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3238                                            | XIMStatusNothing, XNClientWindow, xw.win,
3239                                            XNFocusWindow, xw.win, NULL);
3240         if(xw.xic == NULL)
3241                 die("XCreateIC failed. Could not obtain input method.\n");
3242
3243         /* white cursor, black outline */
3244         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3245         XDefineCursor(xw.dpy, xw.win, cursor);
3246         XRecolorCursor(xw.dpy, cursor,
3247                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3248                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3249
3250         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3251         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3252         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3253         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3254
3255         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3256         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3257                         PropModeReplace, (uchar *)&thispid, 1);
3258
3259         xresettitle();
3260         XMapWindow(xw.dpy, xw.win);
3261         xhints();
3262         XSync(xw.dpy, False);
3263 }
3264
3265 int
3266 xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
3267 {
3268         float winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch, xp, yp;
3269         ushort mode, prevmode = USHRT_MAX;
3270         Font *font = &dc.font;
3271         int frcflags = FRC_NORMAL;
3272         float runewidth = xw.cw;
3273         Rune rune;
3274         FT_UInt glyphidx;
3275         FcResult fcres;
3276         FcPattern *fcpattern, *fontpattern;
3277         FcFontSet *fcsets[] = { NULL };
3278         FcCharSet *fccharset;
3279         int i, f, numspecs = 0;
3280
3281         for(i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
3282                 /* Fetch rune and mode for current glyph. */
3283                 rune = glyphs[i].u;
3284                 mode = glyphs[i].mode;
3285
3286                 /* Skip dummy wide-character spacing. */
3287                 if(mode == ATTR_WDUMMY)
3288                         continue;
3289
3290                 /* Determine font for glyph if different from previous glyph. */
3291                 if(prevmode != mode) {
3292                         prevmode = mode;
3293                         font = &dc.font;
3294                         frcflags = FRC_NORMAL;
3295                         runewidth = xw.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
3296                         if((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
3297                                 font = &dc.ibfont;
3298                                 frcflags = FRC_ITALICBOLD;
3299                         } else if(mode & ATTR_ITALIC) {
3300                                 font = &dc.ifont;
3301                                 frcflags = FRC_ITALIC;
3302                         } else if(mode & ATTR_BOLD) {
3303                                 font = &dc.bfont;
3304                                 frcflags = FRC_BOLD;
3305                         }
3306                         yp = winy + font->ascent;
3307                 }
3308
3309                 /* Lookup character index with default font. */
3310                 glyphidx = XftCharIndex(xw.dpy, font->match, rune);
3311                 if(glyphidx) {
3312                         specs[numspecs].font = font->match;
3313                         specs[numspecs].glyph = glyphidx;
3314                         specs[numspecs].x = (short)xp;
3315                         specs[numspecs].y = (short)yp;
3316                         xp += runewidth;
3317                         numspecs++;
3318                         continue;
3319                 }
3320
3321                 /* Fallback on font cache, search the font cache for match. */
3322                 for(f = 0; f < frclen; f++) {
3323                         glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
3324                         /* Everything correct. */
3325                         if(glyphidx && frc[f].flags == frcflags)
3326                                 break;
3327                         /* We got a default font for a not found glyph. */
3328                         if(!glyphidx && frc[f].flags == frcflags
3329                                         && frc[f].unicodep == rune) {
3330                                 break;
3331                         }
3332                 }
3333
3334                 /* Nothing was found. Use fontconfig to find matching font. */
3335                 if(f >= frclen) {
3336                         if(!font->set)
3337                                 font->set = FcFontSort(0, font->pattern,
3338                                                        FcTrue, 0, &fcres);
3339                         fcsets[0] = font->set;
3340
3341                         /*
3342                          * Nothing was found in the cache. Now use
3343                          * some dozen of Fontconfig calls to get the
3344                          * font for one single character.
3345                          *
3346                          * Xft and fontconfig are design failures.
3347                          */
3348                         fcpattern = FcPatternDuplicate(font->pattern);
3349                         fccharset = FcCharSetCreate();
3350
3351                         FcCharSetAddChar(fccharset, rune);
3352                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3353                                         fccharset);
3354                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3355                                         FcTrue);
3356
3357                         FcConfigSubstitute(0, fcpattern,
3358                                         FcMatchPattern);
3359                         FcDefaultSubstitute(fcpattern);
3360
3361                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3362                                         fcpattern, &fcres);
3363
3364                         /*
3365                          * Overwrite or create the new cache entry.
3366                          */
3367                         if(frclen >= LEN(frc)) {
3368                                 frclen = LEN(frc) - 1;
3369                                 XftFontClose(xw.dpy, frc[frclen].font);
3370                                 frc[frclen].unicodep = 0;
3371                         }
3372
3373                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3374                                         fontpattern);
3375                         frc[frclen].flags = frcflags;
3376                         frc[frclen].unicodep = rune;
3377
3378                         glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
3379
3380                         f = frclen;
3381                         frclen++;
3382
3383                         FcPatternDestroy(fcpattern);
3384                         FcCharSetDestroy(fccharset);
3385                 }
3386
3387                 specs[numspecs].font = frc[f].font;
3388                 specs[numspecs].glyph = glyphidx;
3389                 specs[numspecs].x = (short)xp;
3390                 specs[numspecs].y = (short)(winy + frc[f].font->ascent);
3391                 xp += runewidth;
3392                 numspecs++;
3393         }
3394
3395         return numspecs;
3396 }
3397
3398 void
3399 xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y) {
3400         int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
3401         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3402             width = charlen * xw.cw;
3403         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3404         XRenderColor colfg, colbg;
3405         XRectangle r;
3406
3407         /* Determine foreground and background colors based on mode. */
3408         if(base.fg == defaultfg) {
3409                 if(base.mode & ATTR_ITALIC)
3410                         base.fg = defaultitalic;
3411                 else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
3412                         base.fg = defaultitalic;
3413                 else if(base.mode & ATTR_UNDERLINE)
3414                         base.fg = defaultunderline;
3415         }
3416
3417         if(IS_TRUECOL(base.fg)) {
3418                 colfg.alpha = 0xffff;
3419                 colfg.red = TRUERED(base.fg);
3420                 colfg.green = TRUEGREEN(base.fg);
3421                 colfg.blue = TRUEBLUE(base.fg);
3422                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3423                 fg = &truefg;
3424         } else {
3425                 fg = &dc.col[base.fg];
3426         }
3427
3428         if(IS_TRUECOL(base.bg)) {
3429                 colbg.alpha = 0xffff;
3430                 colbg.green = TRUEGREEN(base.bg);
3431                 colbg.red = TRUERED(base.bg);
3432                 colbg.blue = TRUEBLUE(base.bg);
3433                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3434                 bg = &truebg;
3435         } else {
3436                 bg = &dc.col[base.bg];
3437         }
3438
3439         /* Change basic system colors [0-7] to bright system colors [8-15] */
3440         if((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
3441                 fg = &dc.col[base.fg + 8];
3442
3443         if(IS_SET(MODE_REVERSE)) {
3444                 if(fg == &dc.col[defaultfg]) {
3445                         fg = &dc.col[defaultbg];
3446                 } else {
3447                         colfg.red = ~fg->color.red;
3448                         colfg.green = ~fg->color.green;
3449                         colfg.blue = ~fg->color.blue;
3450                         colfg.alpha = fg->color.alpha;
3451                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3452                                         &revfg);
3453                         fg = &revfg;
3454                 }
3455
3456                 if(bg == &dc.col[defaultbg]) {
3457                         bg = &dc.col[defaultfg];
3458                 } else {
3459                         colbg.red = ~bg->color.red;
3460                         colbg.green = ~bg->color.green;
3461                         colbg.blue = ~bg->color.blue;
3462                         colbg.alpha = bg->color.alpha;
3463                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3464                                         &revbg);
3465                         bg = &revbg;
3466                 }
3467         }
3468
3469         if(base.mode & ATTR_REVERSE) {
3470                 temp = fg;
3471                 fg = bg;
3472                 bg = temp;
3473         }
3474
3475         if((base.mode & ATTR_BOLD_FAINT) == ATTR_FAINT) {
3476                 colfg.red = fg->color.red / 2;
3477                 colfg.green = fg->color.green / 2;
3478                 colfg.blue = fg->color.blue / 2;
3479                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3480                 fg = &revfg;
3481         }
3482
3483         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3484                 fg = bg;
3485
3486         if(base.mode & ATTR_INVISIBLE)
3487                 fg = bg;
3488
3489         /* Intelligent cleaning up of the borders. */
3490         if(x == 0) {
3491                 xclear(0, (y == 0)? 0 : winy, borderpx,
3492                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3493         }
3494         if(x + charlen >= term.col) {
3495                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3496                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3497         }
3498         if(y == 0)
3499                 xclear(winx, 0, winx + width, borderpx);
3500         if(y == term.row-1)
3501                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3502
3503         /* Clean up the region we want to draw to. */
3504         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3505
3506         /* Set the clip region because Xft is sometimes dirty. */
3507         r.x = 0;
3508         r.y = 0;
3509         r.height = xw.ch;
3510         r.width = width;
3511         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3512
3513         /* Render the glyphs. */
3514         XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
3515
3516         /* Render underline and strikethrough. */
3517         if(base.mode & ATTR_UNDERLINE) {
3518                 XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent + 1,
3519                                 width, 1);
3520         }
3521
3522         if(base.mode & ATTR_STRUCK) {
3523                 XftDrawRect(xw.draw, fg, winx, winy + 2 * dc.font.ascent / 3,
3524                                 width, 1);
3525         }
3526
3527         /* Reset clip to none. */
3528         XftDrawSetClip(xw.draw, 0);
3529 }
3530
3531 void
3532 xdrawglyph(Glyph g, int x, int y) {
3533         int numspecs;
3534         XftGlyphFontSpec spec;
3535         numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
3536         xdrawglyphfontspecs(&spec, g, numspecs, x, y);
3537 }
3538
3539 void
3540 xdrawcursor(void) {
3541         static int oldx = 0, oldy = 0;
3542         int curx;
3543         Glyph g = {' ', ATTR_NULL, defaultbg, defaultcs};
3544
3545         LIMIT(oldx, 0, term.col-1);
3546         LIMIT(oldy, 0, term.row-1);
3547
3548         curx = term.c.x;
3549
3550         /* adjust position if in dummy */
3551         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3552                 oldx--;
3553         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3554                 curx--;
3555
3556         g.u = term.line[term.c.y][term.c.x].u;
3557
3558         /* remove the old cursor */
3559         xdrawglyph(term.line[oldy][oldx], oldx, oldy);
3560
3561         if(IS_SET(MODE_HIDE))
3562                 return;
3563
3564         /* draw the new one */
3565         if(xw.state & WIN_FOCUSED) {
3566                 switch (xw.cursor) {
3567                         case 0: /* Blinking Block */
3568                         case 1: /* Blinking Block (Default) */
3569                         case 2: /* Steady Block */
3570                                 if(IS_SET(MODE_REVERSE)) {
3571                                                 g.mode |= ATTR_REVERSE;
3572                                                 g.fg = defaultcs;
3573                                                 g.bg = defaultfg;
3574                                         }
3575
3576                                 g.mode |= term.line[term.c.y][curx].mode & ATTR_WIDE;
3577                                 xdrawglyph(g, term.c.x, term.c.y);
3578                                 break;
3579                         case 3: /* Blinking Underline */
3580                         case 4: /* Steady Underline */
3581                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3582                                                 borderpx + curx * xw.cw,
3583                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3584                                                 xw.cw, cursorthickness);
3585                                 break;
3586                         case 5: /* Blinking bar */
3587                         case 6: /* Steady bar */
3588                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3589                                                 borderpx + curx * xw.cw,
3590                                                 borderpx + term.c.y * xw.ch,
3591                                                 cursorthickness, xw.ch);
3592                                 break;
3593                 }
3594         } else {
3595                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3596                                 borderpx + curx * xw.cw,
3597                                 borderpx + term.c.y * xw.ch,
3598                                 xw.cw - 1, 1);
3599                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3600                                 borderpx + curx * xw.cw,
3601                                 borderpx + term.c.y * xw.ch,
3602                                 1, xw.ch - 1);
3603                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3604                                 borderpx + (curx + 1) * xw.cw - 1,
3605                                 borderpx + term.c.y * xw.ch,
3606                                 1, xw.ch - 1);
3607                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3608                                 borderpx + curx * xw.cw,
3609                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3610                                 xw.cw, 1);
3611         }
3612         oldx = curx, oldy = term.c.y;
3613 }
3614
3615
3616 void
3617 xsettitle(char *p) {
3618         XTextProperty prop;
3619
3620         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3621                         &prop);
3622         XSetWMName(xw.dpy, xw.win, &prop);
3623         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3624         XFree(prop.value);
3625 }
3626
3627 void
3628 xresettitle(void) {
3629         xsettitle(opt_title ? opt_title : "st");
3630 }
3631
3632 void
3633 redraw(void) {
3634         tfulldirt();
3635         draw();
3636 }
3637
3638 void
3639 draw(void) {
3640         drawregion(0, 0, term.col, term.row);
3641         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3642                         xw.h, 0, 0);
3643         XSetForeground(xw.dpy, dc.gc,
3644                         dc.col[IS_SET(MODE_REVERSE)?
3645                                 defaultfg : defaultbg].pixel);
3646 }
3647
3648 void
3649 drawregion(int x1, int y1, int x2, int y2) {
3650         int i, x, y, ox, numspecs;
3651         Glyph base, new;
3652         XftGlyphFontSpec* specs;
3653         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3654
3655         if(!(xw.state & WIN_VISIBLE))
3656                 return;
3657
3658         for(y = y1; y < y2; y++) {
3659                 if(!term.dirty[y])
3660                         continue;
3661
3662                 xtermclear(0, y, term.col, y);
3663                 term.dirty[y] = 0;
3664
3665                 specs = term.specbuf;
3666                 numspecs = xmakeglyphfontspecs(specs, &term.line[y][0], x2 - x1, x1, y);
3667
3668                 i = ox = 0;
3669                 for(x = x1; x < x2 && i < numspecs; x++) {
3670                         new = term.line[y][x];
3671                         if(new.mode == ATTR_WDUMMY)
3672                                 continue;
3673                         if(ena_sel && selected(x, y))
3674                                 new.mode ^= ATTR_REVERSE;
3675                         if(i > 0 && ATTRCMP(base, new)) {
3676                                 xdrawglyphfontspecs(specs, base, i, ox, y);
3677                                 specs += i;
3678                                 numspecs -= i;
3679                                 i = 0;
3680                         }
3681                         if(i == 0) {
3682                                 ox = x;
3683                                 base = new;
3684                         }
3685                         i++;
3686                 }
3687                 if(i > 0)
3688                         xdrawglyphfontspecs(specs, base, i, ox, y);
3689         }
3690         xdrawcursor();
3691 }
3692
3693 void
3694 expose(XEvent *ev) {
3695         redraw();
3696 }
3697
3698 void
3699 visibility(XEvent *ev) {
3700         XVisibilityEvent *e = &ev->xvisibility;
3701
3702         MODBIT(xw.state, e->state != VisibilityFullyObscured, WIN_VISIBLE);
3703 }
3704
3705 void
3706 unmap(XEvent *ev) {
3707         xw.state &= ~WIN_VISIBLE;
3708 }
3709
3710 void
3711 xsetpointermotion(int set) {
3712         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3713         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3714 }
3715
3716 void
3717 xseturgency(int add) {
3718         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3719
3720         MODBIT(h->flags, add, XUrgencyHint);
3721         XSetWMHints(xw.dpy, xw.win, h);
3722         XFree(h);
3723 }
3724
3725 void
3726 focus(XEvent *ev) {
3727         XFocusChangeEvent *e = &ev->xfocus;
3728
3729         if(e->mode == NotifyGrab)
3730                 return;
3731
3732         if(ev->type == FocusIn) {
3733                 XSetICFocus(xw.xic);
3734                 xw.state |= WIN_FOCUSED;
3735                 xseturgency(0);
3736                 if(IS_SET(MODE_FOCUS))
3737                         ttywrite("\033[I", 3);
3738         } else {
3739                 XUnsetICFocus(xw.xic);
3740                 xw.state &= ~WIN_FOCUSED;
3741                 if(IS_SET(MODE_FOCUS))
3742                         ttywrite("\033[O", 3);
3743         }
3744 }
3745
3746 bool
3747 match(uint mask, uint state) {
3748         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3749 }
3750
3751 void
3752 numlock(const Arg *dummy) {
3753         term.numlock ^= 1;
3754 }
3755
3756 char*
3757 kmap(KeySym k, uint state) {
3758         Key *kp;
3759         int i;
3760
3761         /* Check for mapped keys out of X11 function keys. */
3762         for(i = 0; i < LEN(mappedkeys); i++) {
3763                 if(mappedkeys[i] == k)
3764                         break;
3765         }
3766         if(i == LEN(mappedkeys)) {
3767                 if((k & 0xFFFF) < 0xFD00)
3768                         return NULL;
3769         }
3770
3771         for(kp = key; kp < key + LEN(key); kp++) {
3772                 if(kp->k != k)
3773                         continue;
3774
3775                 if(!match(kp->mask, state))
3776                         continue;
3777
3778                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3779                         continue;
3780                 if(term.numlock && kp->appkey == 2)
3781                         continue;
3782
3783                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3784                         continue;
3785
3786                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3787                         continue;
3788
3789                 return kp->s;
3790         }
3791
3792         return NULL;
3793 }
3794
3795 void
3796 kpress(XEvent *ev) {
3797         XKeyEvent *e = &ev->xkey;
3798         KeySym ksym;
3799         char buf[32], *customkey;
3800         int len;
3801         Rune c;
3802         Status status;
3803         Shortcut *bp;
3804
3805         if(IS_SET(MODE_KBDLOCK))
3806                 return;
3807
3808         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3809         /* 1. shortcuts */
3810         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3811                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3812                         bp->func(&(bp->arg));
3813                         return;
3814                 }
3815         }
3816
3817         /* 2. custom keys from config.h */
3818         if((customkey = kmap(ksym, e->state))) {
3819                 ttysend(customkey, strlen(customkey));
3820                 return;
3821         }
3822
3823         /* 3. composed string from input method */
3824         if(len == 0)
3825                 return;
3826         if(len == 1 && e->state & Mod1Mask) {
3827                 if(IS_SET(MODE_8BIT)) {
3828                         if(*buf < 0177) {
3829                                 c = *buf | 0x80;
3830                                 len = utf8encode(c, buf);
3831                         }
3832                 } else {
3833                         buf[1] = buf[0];
3834                         buf[0] = '\033';
3835                         len = 2;
3836                 }
3837         }
3838         ttysend(buf, len);
3839 }
3840
3841
3842 void
3843 cmessage(XEvent *e) {
3844         /*
3845          * See xembed specs
3846          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3847          */
3848         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3849                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3850                         xw.state |= WIN_FOCUSED;
3851                         xseturgency(0);
3852                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3853                         xw.state &= ~WIN_FOCUSED;
3854                 }
3855         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3856                 /* Send SIGHUP to shell */
3857                 kill(pid, SIGHUP);
3858                 exit(EXIT_SUCCESS);
3859         }
3860 }
3861
3862 void
3863 cresize(int width, int height) {
3864         int col, row;
3865
3866         if(width != 0)
3867                 xw.w = width;
3868         if(height != 0)
3869                 xw.h = height;
3870
3871         col = (xw.w - 2 * borderpx) / xw.cw;
3872         row = (xw.h - 2 * borderpx) / xw.ch;
3873
3874         tresize(col, row);
3875         xresize(col, row);
3876         ttyresize();
3877 }
3878
3879 void
3880 resize(XEvent *e) {
3881         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3882                 return;
3883
3884         cresize(e->xconfigure.width, e->xconfigure.height);
3885 }
3886
3887 void
3888 run(void) {
3889         XEvent ev;
3890         int w = xw.w, h = xw.h;
3891         fd_set rfd;
3892         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3893         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3894         long deltatime;
3895
3896         /* Waiting for window mapping */
3897         do {
3898                 XNextEvent(xw.dpy, &ev);
3899                 if(ev.type == ConfigureNotify) {
3900                         w = ev.xconfigure.width;
3901                         h = ev.xconfigure.height;
3902                 }
3903         } while(ev.type != MapNotify);
3904
3905         ttynew();
3906         cresize(w, h);
3907
3908         clock_gettime(CLOCK_MONOTONIC, &last);
3909         lastblink = last;
3910
3911         for(xev = actionfps;;) {
3912                 FD_ZERO(&rfd);
3913                 FD_SET(cmdfd, &rfd);
3914                 FD_SET(xfd, &rfd);
3915
3916                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3917                         if(errno == EINTR)
3918                                 continue;
3919                         die("select failed: %s\n", strerror(errno));
3920                 }
3921                 if(FD_ISSET(cmdfd, &rfd)) {
3922                         ttyread();
3923                         if(blinktimeout) {
3924                                 blinkset = tattrset(ATTR_BLINK);
3925                                 if(!blinkset)
3926                                         MODBIT(term.mode, 0, MODE_BLINK);
3927                         }
3928                 }
3929
3930                 if(FD_ISSET(xfd, &rfd))
3931                         xev = actionfps;
3932
3933                 clock_gettime(CLOCK_MONOTONIC, &now);
3934                 drawtimeout.tv_sec = 0;
3935                 drawtimeout.tv_nsec =  (1000 * 1E6)/ xfps;
3936                 tv = &drawtimeout;
3937
3938                 dodraw = 0;
3939                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3940                         tsetdirtattr(ATTR_BLINK);
3941                         term.mode ^= MODE_BLINK;
3942                         lastblink = now;
3943                         dodraw = 1;
3944                 }
3945                 deltatime = TIMEDIFF(now, last);
3946                 if(deltatime > 1000 / (xev ? xfps : actionfps)) {
3947                         dodraw = 1;
3948                         last = now;
3949                 }
3950
3951                 if(dodraw) {
3952                         while(XPending(xw.dpy)) {
3953                                 XNextEvent(xw.dpy, &ev);
3954                                 if(XFilterEvent(&ev, None))
3955                                         continue;
3956                                 if(handler[ev.type])
3957                                         (handler[ev.type])(&ev);
3958                         }
3959
3960                         draw();
3961                         XFlush(xw.dpy);
3962
3963                         if(xev && !FD_ISSET(xfd, &rfd))
3964                                 xev--;
3965                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3966                                 if(blinkset) {
3967                                         if(TIMEDIFF(now, lastblink) \
3968                                                         > blinktimeout) {
3969                                                 drawtimeout.tv_nsec = 1000;
3970                                         } else {
3971                                                 drawtimeout.tv_nsec = (1E6 * \
3972                                                         (blinktimeout - \
3973                                                         TIMEDIFF(now,
3974                                                                 lastblink)));
3975                                         }
3976                                         drawtimeout.tv_sec = \
3977                                             drawtimeout.tv_nsec / 1E9;
3978                                         drawtimeout.tv_nsec %= (long)1E9;
3979                                 } else {
3980                                         tv = NULL;
3981                                 }
3982                         }
3983                 }
3984         }
3985 }
3986
3987 void
3988 usage(void) {
3989         die("%s " VERSION " (c) 2010-2015 st engineers\n"
3990         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3991         "          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n"
3992         "       st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3993         "          [-i] [-t title] [-w windowid] [-l line] [stty_args ...]\n",
3994         argv0);
3995 }
3996
3997 int
3998 main(int argc, char *argv[]) {
3999         uint cols = 80, rows = 24;
4000
4001         xw.l = xw.t = 0;
4002         xw.isfixed = False;
4003         xw.cursor = 0;
4004
4005         ARGBEGIN {
4006         case 'a':
4007                 allowaltscreen = false;
4008                 break;
4009         case 'c':
4010                 opt_class = EARGF(usage());
4011                 break;
4012         case 'e':
4013                 if(argc > 0)
4014                         --argc, ++argv;
4015                 goto run;
4016         case 'f':
4017                 opt_font = EARGF(usage());
4018                 break;
4019         case 'g':
4020                 xw.gm = XParseGeometry(EARGF(usage()),
4021                                 &xw.l, &xw.t, &cols, &rows);
4022                 break;
4023         case 'i':
4024                 xw.isfixed = True;
4025                 break;
4026         case 'o':
4027                 opt_io = EARGF(usage());
4028                 break;
4029         case 'l':
4030                 opt_line = EARGF(usage());
4031                 break;
4032         case 't':
4033                 opt_title = EARGF(usage());
4034                 break;
4035         case 'w':
4036                 opt_embed = EARGF(usage());
4037                 break;
4038         case 'v':
4039         default:
4040                 usage();
4041         } ARGEND;
4042
4043 run:
4044         if(argc > 0) {
4045                 /* eat all remaining arguments */
4046                 opt_cmd = argv;
4047                 if(!opt_title && !opt_line)
4048                         opt_title = basename(xstrdup(argv[0]));
4049         }
4050         setlocale(LC_CTYPE, "");
4051         XSetLocaleModifiers("");
4052         tnew(MAX(cols, 1), MAX(rows, 1));
4053         xinit();
4054         selinit();
4055         run();
4056
4057         return 0;
4058 }
4059